Allen, J.R.L.1965: Coastal geomorphology of eastern Nigeria: beach ridge barrier islands and vegetated tidal flats. Geologie en Mijnbouw44, 1-21.
2.
Armon, J.W.1979: Landward sediment transfers in a transgressive barrier island system, Canada. In Leatherman, S.P. , editor, Barrier islands, New York : Academic Press, 65-80.
3.
Bagnold, R.A.1941: The physics of blown sand and desert dunes. London: Methuen. (265 pp.)
4.
Barndorff-Nielsen, O., Dalsgaard, K., Halgren, C., Kuhlman, H., Moller, J.T. and Schou, G.1982: Variations in particle size distribution over a small dune. Sedimentology29, 53-65.
5.
Barr, D.A. and McKenzie, J.B.1976: Dune stabilization in Queensland, Australia, using vegetation and mulches. International Journal ofBiometeorology20, 1-8.
6.
Belly, P.Y.1964: Sand movement by wind. United States Army Coastal Engineering Research Centre Technical Memorandum1, 1-38.
7.
Bigarella, J.J.1970/71: Wind pattern deduced from dune morphology and internal structures. Boletim Paranaense Geociencias28/29, 73-114.
8.
1972 : Eolian environments; their characteristics, recognition and importance. In Rigby, J.K. and Hamblin, W.K., editors, Recognition of ancient sedimentary environments, Tulsa: Society of Economic Palaeontologists and Mineralogists, 12-62.
9.
1975a: Lagoa dune field, State of Santa Catarina, Brazil, a model of eolian and pluvial activity. Boletim Paranaense de Geociencias33, 133-68.
10.
1975b: Structures developed by dissipation of dune and beach ridge deposits. Catena2, 107-152.
11.
1979 a: Structural features at Lagoa dunefield, Brazil. United States Geological Survey Professional Paper 152, 114-24.
12.
1979 b: Dissipation of dunes, Lagoa, Brazil. United States Geological Survey Professional Paper 1052, 124-34.
13.
Bigarella, J.J., Becker, R.D. and Duarte, G.M.1969a: Coastal dune structures from Parana (Brazil). Marine Geology7,5-55.
14.
Bigarella, J.J., Alessi, A.H., Becker, R.D. and Duarte, G.M.1969b: Textural characteristics of the coastal dune, sand ridge and beach sediments. Boletim Paranaense de Geociencias27, 15-80.
15.
Bigarella, J.J., Duarte, G.M. and Becker, R.D.1970-71: Structural characteristics of the dune, foredune, interdune, beach, beach-dune ridge and sand ridge deposits. Boletim Paranaense de Geociencias28/29, 9-72.
16.
Bird, E.C.F.1965: The formation of coastal sand dunes in the humid tropics: some evidence from North Queensland. AustralianJournal of Science27, 258-59.
17.
Boorman, L.A.1977: Sand dunes. In Barnes, R.S.K., editor, The coastline, Chichester : John Wiley, 161-97.
18.
Borowka, R.K.1980: Present day dune processes and dune morphology on the Leba Barrier, Polish coast of the Baltic. Geografiska Annaler62A, 75-82.
19.
Bressolier, C. and Thomas, Y.F.1977: Studies on wind and plant interactions on French Atlantic coastal dunes. Journal of Sedimentary Petrology47, 331-38.
20.
Buchbinder, L.G. and Friedman, G.M.1980: Vadose, phreatic and marine diagenesis of Pleistocene-Holocene carbonates in a borehole: Mediterranean coast of Israel. Journal of Sedimentary Petrology50, 395-408.
21.
Buffault, P.1942: Histoire des dunes maritimes de la Gascogne. Bordeaux: Éditions Delmas. (446 pp.)
22.
Calkin, P.E. and Rutford, R.H.1974: The sand dunes of Victoria Valley, Antarctica. Geographical Review64, 189-216.
23.
Campbell, M.R.1915: Movement of sand dunes on the California coast . Journal of the Washington Academy of Science5, 328.
24.
Carter, L.D.1981: A Pleistocene sand sea on the Alaskan Arctic coastal plain . Science211, 381-83.
Chepil, W.S.1945a: Dynamics of wind erosion. I Nature of movement of soil by wind. Soil Science60, 305-320.
27.
1945b: Dynamics of wind erosion. II Initiation of soil movement . Soil Science60, 397-411.
28.
Chepil, W.S. and Woodruff, N.P.1963: The physics of wind erosion and its control. Advances in Agronomy15, 211-302.
29.
Coetzee, F.1975a: Coastal aeolianites at Black Rock, Northern Zululand . Transactions of the Geological Society of South Africa78, 313-22.
30.
1975b: Solution pipes in coastal aeolianites of Zululand and Mozambique. Transactions of the Geological Society of South Africa78, 323-33.
31.
Cooper, W.S.1958: Coastal sand dunes of Oregon and Washington. Geological Society of America Memoir72. (169 pp.)
32.
1967: Coastal dunes of California. Geological Society of America Memoir104. (131 pp.)
33.
David, P.P.1977: Sand dune occurrences of Canada. National Parks Branch, Canada, Department of Indian and Northern Affairs, Contract 74-230, Report. (183 pp.)
34.
Davies, J.L.1964: A morphogenic approach to world shorelines. Zeitschrift für Geomorphologie8, Mortensen Sonderheft, 127-42.
35.
Day, A.E.1928: Pipes in the coast sandstone of Syria. Geological Magazine65, 412-15.
36.
Depuydt, F.1972: De Belgische strand-en duinformaties in het kadar van de geomorfologie der zuidoostelijke Noordzeekust. Verhandelingen Koninklijke Academie voor Wetenschappen, Letteren en Schone Kunsten Van Belgie. (228 pp.)
37.
Dolan, R.1972: Barrier dune system along the outer banks of North Carolina: a reappraisal. Science176, 286-88.
38.
Dolan, R., Hayden, B. and Heywood, J.1978: Analysis of coastal erosion and storm surge hazard . Coastal Engineering2, 41-53.
39.
Edelman, T.1968: Dune erosion during storm conditions. Proceedings of the 11 th Coastal Engineering Conference, 719-22.
40.
1973 : Dune erosion during storm conditions. Proceedings of the 12th Coastal Engineering Conference, 1305-12.
41.
Fairbridge, R.W. and Teichert, C.1953: Soil horizons and marine bands in the coastal limestone of Western Australia. Journal and Proceedings of the Royal Society of New South Wales86, 68-86.
42.
Finkel, H.J.1959: The barchans of southern Peru. Journal of Geology67, 614-47.
43.
Friedman, G.M.1961: Distinction between dune, beach, and river sands from their textural characteristics. Journal of Sedimentary Petrology31, 514-29.
44.
Gage, B.O.1970: Experimental dunes on the Texas coast. United States Army Coastal Engineering Research Center Miscellaneous Paper 1-70. (30 pp.)
45.
Gardner, R.A.M.1981: Reddening of dune sands - evidence from southeast India . Earth Surface Processes and Landforms6, 459-68.
1983 b: Aeolianite. In Goudie, A.S. and Pye, K., editors, Chemical sediments and geomorphology, London: Academic Press, 265-300.
48.
Gardner, R.A.M. and Pye, K.1981: Nature, origin and palaeoenvironmental significance of red coastal and desert dune sands. Progress in Physical Geography5,514-34.
49.
Gares, P.A., Nordstrom, K.F. and Psuty, N.P.1979: Coastal dunes: their function, delineation and management. Center for Coastal and Environmental Studies, Rutgers University . (112 pp.)
50.
Gavish, E. and Friedman, G.M.1969: Progressive diagenesis in late Tertiary sediments: sequence and timescale. Journal of Sedimentary Petrology39, 980-1006.
51.
Goldsmith, V.J.1973: Internal geometry and origin of vegetated coastal sand dunes. Journal of Sedimentary Petrology43, 1128-42.
52.
1978 : Coastal Dunes. In Davis, R.A. Jr, editor, Coastal sedimentary environments, New York: Springer Verlag, 171-235.
53.
Goudie, A.S. editor, 1981: Geomorphological techniques. London: George Allen and Unwin. (395 pp.)
54.
Greenwood, B.1969: Sedimentary parameters and environmental discrimination: an application of multivariate statistics. Canadian Journal of Earth Sciences6, 1347-58.
55.
1972: Modern analogues and the evaluation of a Pleistocene sedimentary sequence. Transactions of the Institute of British Geographers56, 145-69.
56.
1978: Spatial variability of texture over a beach-dune complex, north Devon, England. Sedimentary Geology21, 27-44.
57.
Guilcher, A. and Joly, F.1954: Récherches sur la morphologie de la Côte Atlantique du Maroc. Travaux de la Institute Scientifique Chérifien, Series Geologie et GéographiePhysique2.
58.
Harlé, E. and Harlé, J.1920: Mémoire sur les dunes de Gascogne avec observations sur la formation des dunes. Bulletin du Comité des Travaux Historiques et Scientifiques, Section de Géographie34, 1-145.
59.
Harmon, R.S., Land, L.S., Mitterer, R.M., Garrett, P., Schwarcz, H.P. and Larson, G.J.1981: Bermuda during the last interglacial. Nature289, 481-83.
60.
Hesp, P.A.1981: The formation of shadow dunes. Journal of Sedimentary Petrology51, 101-112.
61.
Hesp, P. and Short, A.1980: Dune forms of the Younghusband Peninsula, SE South Australia . Proceedings of the Conference on Aeolian Landscapes in the semiarid region of South Eastern Australia, Australian Society of Soil Science, Riverina Branch , 65-66.
62.
Hopley, D.1970: The geomorphology of the Burdekin Delta. Department of Geography, James Cook University of North Queensland , Monograph Series 1. (66 pp.)
63.
1979: Australian landform example No. 35. Deltaic barrier spit . Australian Geographer14, 248-51.
64.
Horikawa, K. and Shen, H.1960: Sand movement by wind action - on the characteristics of sand. Beach Erosion Board Technical Memorandum119 (51 pp.)
65.
Hsu, S.A.1971a: Measurement of shear stress and roughness length on a beach. Journal of Geophysical Research76, 2880-85.
66.
1971 b: Wind stress criteria in eolian sand transport. Journal of Geophysical Research76, 8684-86.
67.
1972: Boundary layer tradewind profile and stress on a tropical windward coast. Boundary Layer Meteorology2, 284-89.
68.
1973: Computing eolian sand transport from shear velocity measurements . Journal of Geology81, 739-43.
69.
Hunter, R.E.1977: Basic types of stratification in small eolian dunes . Sedimentology24, 361-87.
70.
Inman, D.L., Ewing, G.C. and Corliss, J.B.1966: Coastal sand dunes of Guero Negro, BajaCalifornia, Mexico. Geological Society of America Bulletin77, 787-802.
71.
Jelgersma, S., De Jong, J., Zagwijn, W.H. and Van Regteren Altena, J.F.1970: The coastal dunes of the western Netherlands: geology, vegetational history and archaeology. Mededelingen Rijks Geologische Dienst NS 21, 93-167.
72.
Jennings, J.N.1957: On the orientation of parabolic or U-dunes. Geographical Journal123, 474-80.
73.
1959: The coastal geomorphology of King Island, Bass Strait, in relation to changes in the relative level of land and sea. Records of the Queen Victoria Museum, Lanceston NS22. (39 pp.)
74.
1964: The question of coastal sand dunes in humid tropical climates . Zeitschrift für Geomorphologie8, Mortensen Sonderheft, 150-54.
75.
1965: Further discussion of factors affecting coastal dune formation in the tropics. Australian Journal of Science28, 166-67.
76.
Johnson, J.W.1965: Sand movement on coastal dunes. Federal Inter-Agency Sedimentation Conference Proceedings. United States Department of Agriculture Miscellaneous Publication No. 970, 747-55.
77.
Johnson, J.W. and Kadib, A.A.1965: Sand losses from a coast by wind action. Proceedings of the 9th Coastal Engineering Conference, 368-77.
78.
Kaldi, J., Krinsley, D.H. and Lawson, D.1978: Experimentally-produced aeolian surface textures on quartz sand grains from various environments. In Whalley, W.B., editor, Scanning electron microscopy in the study of sediments, Norwich: Geo Abstracts, 261-74.
79.
Kawamura, R.1964: Study of sand movement by wind. University of California Hydraulics Engineering Laboratory Report HEL 2-8. (38 pp.)
80.
Krinsley, D.H. and McCoy, F.1978: Aeolian quartz sand and silt. In Whalley, W.B., editor, Scanning electron microscopy in the study of sediments, Norwich: Geo Abstracts, 249-60.
81.
Lancaster, N.1982: Dunes on the Skeleton Coast, Namibia (southwest Africa): geomorphology and grain size relationships. Earth Surface Processes and Landforms7, 575-87.
82.
Land, L.S.1970: Phreatic versus vadose meteoric diagenesis of limestones: evidence from a fossil water table. Sedimentology14, 175-85.
83.
Land, L.S., Mackenzie, F.T. and Gould, S.J.1967: Pleistocene history of Bermuda. Geological Society of America Bulletin78, 993-1006.
84.
Landsberg, S.Y.1956: The orientation of dunes in Britain and Denmark in relation to wind. Geographical Journal122, 176-89.
85.
Leatherman, S.P.1976: Barrier island dynamics: overwash processes and eolian transport. Proceedings of the 15th International Coastal Engineering Conference, 1958-74.
86.
1979: Beach and dune interactions during storm conditions. Quarterly Journal of Engineering Geology12, 281-90.
87.
Little, I.P., Armitage, T.M. and Gilkes, R.J.1978: Weathering of quartz in dune sands under subtropical conditions in eastern Australia. Geoderma20, 225-37.
88.
Logan, R.F.1960: The central Namib Desert, southwest Africa. Washington DC: National Research Council Publication758.
89.
Mackenzie, F.T.1964: Bermuda Pleistocene eolianites and paleowinds. Sedimentology3, 52-64.
90.
McBride, E.F. and Hayes, M.O.1962: Dune crossbedding on Mustang Island, Texas. American Association of Petroleum Geologists Bulletin46, 546-51.
91.
McCarthy, M.J.1967: Stratigraphical and sedimentological evidence from the Durban region of major sea-level movements since the late Tertiary. Transactions of the Geological Society of South Africa70, 135-66.
92.
McKee, E.D. and Bigarella, J.J.1972: Deformational structures in Brazilian coastal dunes . Journal of Sedimentary Petrology42, 670-81.
93.
Morton, J.K.1957: Sand dunes on tropical shores. Journal of Ecology44, 495-97.
94.
Nichols, R.L.1961: Characteristics of beaches formed in polar climates . American Journal of Science259, 694-708.
95.
Nossin, J.J.1962: Coastal sedimentation in northeastern Johore. Zeitschrift für Geomorphologie6, 296-316.
96.
1965: Analysis of younger beach ridge deposits in eastern Malaya . Zeitschrift für Geomorphologie9, 186-208.
97.
Obrien, M.P. and Rindlaub, B.D.1936: The transportation of sand by wind. Civil Engineering6, 325-27.
98.
Olson, J.S.1958: Lake Michigan dune development. I Wind velocity profiles . Journal of Geology66, 254-63.
99.
Orme, A.R.1973: Barrier and lagoon systems along the Zululand coast, South Africa. In Coates, D.L., editor, Coastal geomorphology, Binghampton, New York: State University of New York Publications in Geomorphology, 181-217.
100.
Phillips, C.J.1975: Review of selected literature on sand stabilization . Department of Engineering, University of Aberdeen, Report.
101.
Piggott, C.J.1968: A soil survey of the Seychelles. Technical Bulletin No. 2, Land Resources Division, Directorate of Overseas Survey . (89 pp.)
102.
Potts, E.A.1968: The geomorphology of the sand dunes of south Wales, with special reference to the Gower. University of Wales , PhD thesis, 3 volumes.
103.
Pye, K.1980: Beach salcrete and eolian sand transport: evidence from North Queensland. Journal of Sedimentary Petrology50, 257-61.
104.
1981: Rate of dune reddening in a humid tropical climate. Nature290, 582-84.
105.
1982a: Morphological development of coastal dunes in a humid tropical environment, Cape Bedford and Cape Flattery, North Queensland. Geografiska Annaler64A,212-27.
106.
1982b: Morphology and sediments of the Ramsay Bay sand dunes, Hinchinbrook Island, North Queensland. Proceedings of the Royal Society of Queensland93, 31-47.
107.
1982c: Negatively skewed aeolian sands from a humid tropical coastal dunefield, Northern Australia. Sedimentary Geology31, 249-66.
108.
1982d: Characteristics and significance of some humate-cemented sands (humicretes) at Cape Flattery, Queensland, Australia. Geological Magazine119, 229-42.
109.
1982e: Thermoluminescence dating of sand dunes. Nature299, 376.
110.
1983a: Formation and history of Queensland coastal dunes. Zeitschrift für Geomorphology Supplementband45, 175-204.
111.
1983b: Dune formation on the humid tropical sector of the North Queensland coast, Australia. Earth Surface Processes and Landforms8, 371-81.
112.
1983c: Formation of quartz silt during humid tropical weathering of dune sands. Sedimentary Geology34, 267-82.
113.
1983 d: Early postdepositional modification of aeolian dune sands . In Brookfield, M.E. and Ahlbrandt, T.S., editors, Eolian sediments and processes, Amsterdam: Elsevier , 197-221.
114.
1983 e: SEM and microprobe study of the nature and origin of iron oxide-cemented duric layers (petroferric horizons) in the late Quaternary coastal dune formations of northeast Australia. In Whalley, W.B. and Krinsley, D.H., editors, Scanning electron microscopy in geology - a symposium , Norwich: Geo Abstracts. (In press.)
115.
1983 f: Postdepositional reddening in late Quaternary coastal dune sands, northeastern Australia. In Wilson, R.C.L., editor, Residual deposits, Geological Society of London Special Publication No. 11, Oxford: Basil Blackwell, 117-29.
116.
1983 g: Models of transgressive dune building episodes and their relationship to Quaternary sea level changes. In Clark, M., editor, Coastal research: UK perspectives, Norwich: Geo Abstracts. (In press.)
117.
1983h: The coastal dune formations of northern Cape York Peninsula, Queensland. Proceedings of the Royal Society of Queensland94, 33-39.
118.
Pye, K. and Switsur, V.R.1981: Radiocarbon dates from the Cape Bedford-Cape Flattery dunefield, North Queensland. Search12, 225-26.
119.
Pye, K. and Bowman, G.M. forthcoming: Coastal dune development during a marine transgression . In Thom, B.G., editor, Australian coastal geomorphology, Sydney: Academic Press.
120.
Ranwell, D.S.1972: Ecology of salt marshes and sand dunes. London: Chapman and Hall. (258 pp.)
121.
Raup, H.M. and Argus, G.W.1982: The Lake Athabasca sand dunes of northern Saskatchewan and Alberta, Canada. I The land and vegetation. National Museums of Canada Publications in Botany12. (96 pp.)
122.
Reeckman, S.A. and Gill, E.D.1981: Rates of vadose diagenesis in Quaternary dune and shallow marine calcarenites, Warrnambool, Victoria, Australia. Sedimentary Geology30, 157-72.
123.
Salisbury, E.J.1952: Downs and dunes: their plant life and its environment . London: Bell.
124.
Sayles, R.W.1931: Bermuda during the Ice Age. Proceedings of the American Academy of Arts and Science66, 381-468.
125.
Schofield, J.C.1975: Sea-level fluctuations cause periodic, postglacial progradation, south Kaipara Barrier, North Island, New Zealand. New ZealandJournal of Geology and Geophysics18, 295-316.
126.
Semeniuk, V. and Meagher, T.D.1981: Calcrete in Quaternary coastal dunes in southwestern Australia: a capillary rise phenomenon associated with plants. Journal of Sedimentary Petrology51, 47-68.
127.
Setlow, L.W.1978: Age determination of reddened coastal dunes by scanning electron microscopy. In Whalley, W.B., editor, Scanning electron microscopy in the study of sediments, Norwich: Geo Abstracts , 283-306.
128.
Shepard, F.P. and Young, R.1961: Distinguishing between beach and dune sands. Journal of Sedimentary Petrology31, 196-214.
129.
Short, A.D. and Hesp, P.A.1982: Wave, beach and dune interactions in southeastern Australia . Marine Geology48, 259-84.
130.
Siddiquie, H.N.1966: Provenance of the dune sands of the Balasore coast, Orissa. Records of theGeological Survey of India94, 229-44.
131.
Singhvi, A.K., Sharma, Y.P. and Agrawal, D.P.1982: Thermoluminescence dating of sand dunes in Rajasthan, India, Nature295, 313-15.
132.
Stearns, H.T.1970: Ages of dunes on Hawaii. Bernice P. Bishop Museum Occasional Papers 24, 49-72.
133.
Svasek, J.N. and Terwindt, J.H.1974: Measurements of sand transport by wind on a natural beach . Sedimentology21, 311-22.
134.
Swan, B.1979a: Sand dunes in the humid tropics: Sri Lanka. Zeitschrift für Geomorphologie23, 152-71.
135.
1979b: The presence of sand dunes in a tropical low energy zone, Friday Island, Torres Strait (Australia). Révue Géomorphologie Dynamique28, 61-72.
136.
1981: Dunes on Friday Island, North Queensland. Singapore Journal of Tropical Geography2, 114-28.
137.
Talbot, M.R.1981: Holocene changes in tropical wind intensity and rainfall: evidence from southeast Ghana. Quaternary Research16, 202-220.
138.
Thom, B.G.1974: Coastal erosion in eastern Australia. Search5, 198-209.
139.
1978 : Coastal sand deposition in southeast Australia during the Holocene. In Davies, J.L. and Williams, M.A.J., editors, Landform evolution in Australasia, Canberra: ANU Press , 197-214.
140.
Thom, B.G., Polach, H.A. and Bowman, G.M.1978: Holocene age structure of coastal sand barriers in New South Wales, Australia. Department of Geography , Faculty of Military Studies, University of New South Wales. (86 pp.)
141.
Thom, B.G., Bowman, G.M. and Roy, P.S.1981a: Late Quaternary evolution of coastal sand barriers, Port Stephens-Myall Lakes area, central New South Wales, Australia. Quaternary Research15, 345-64.
142.
Thom, B.G., Bowman, G.M., Gillespie, R., Temple, R. and Barbetti, M.1981 b: Radiocarbon dating of Holocene beach ridge sequences in southeast Australia. Department of Geography, Royal Military College, Duntroon, Monograph 11. (36 pp.)
143.
Thompson, C.H.1981: Podzol chronosequences on coastal dunes in eastern Australia . Nature291, 59-61.
144.
Vacher, H.L. and Mackenzie, F.T.1970: Pleistocene lithosomes of Bermuda. American Association of Petroleum Geologists Bulletin54, 873-74.
145.
Valencia, M.J.1977: Christmas Island (Pacific Ocean): reconnaissance geologic observations. Atoll Research Bulletin197.
Ward, W.C.1973: Influence of climate on the early diagenesis of carbonate eolianites. Geology1, 171-74.
148.
1975: Petrology and diagenesis of carbonate eolianites of northeastern Yucatan Peninsula, Mexico. In Wantland, K.F. and Pusey, W.C. III, editors, Belize shelf - carbonate sediments, clastic sediments and ecology, American Association of Petroleum Geologists Studies in Geology No. 2, 500-571.
149.
Ward, W.T.1977: Sand movement on Fraser Island: a response to changing climates. University of Queensland Anthropology Museum, Occasional Papers in Anthropology No. 8, 113-26.
150.
Ward, W.T., Little, I.P. and Thompson, C.H.1979: Stratigraphy of two sandrocks at Rainbow Beach, Queensland, and some notes on their composition. Palaeogeography, Palaeoclimatology, Palaeoecology26, 305-316.
151.
Warren, A.1979: Aeolian processes. In Embleton, C.H. and Thornes, J., editors, Process in geomorphology, London: Edward Arnold, 325-51.
152.
Wellendorf, W. and Krinsley, D.H.1980: The relation between the crystallography of quartz and upturned aeolian cleavage plates. Sedimentology27, 447-53.
153.
Wintle, A.G. and Huntley, D.J.1982: Thermoluminescence dating of sediments. Quaternary Science Reviews1, 31-53.
154.
Wong, P.P.1981: Beach changes on a monsoon coast, Peninsular Malaysia. Geological Society of MalaysiaBulletin14, 59-74.
155.
Yaalon, D.H.1967: Factors affecting the lithification of aeolianite and interpretation of its environmental significance in the coastal plain of Israel . Journal of Sedimentary Petrology37, 1189-99.
156.
Yaalon, D.H. and Laronne, J.1971: Internal structures in eolianites and palaeowinds, Mediterranean coast, Israel. Journal of Sedimentary Petrology41, 1059-64.
157.
Zingg, A.W.1952: Wind-tunnel studies of the movement of sedimentary material. Proceedings of the 5th Hydraulics Conference State University of Iowa Studies in Engineering Bulletin 34, 111-35.