Book reviews: Washburn,A.L. 1979: Geocryology: a survey of periglacial processes and environ ments. London: Edward Arnold. x + 406 pp. £27.50

Ball, D.F. and Goodier, R. 1970: Morphology and distribution of features resulting from frost action in Snowdonia. Field Studies 3, 193-217.

Ball, D.F. and Goodier, R. 1974: Ronas Hill, Shetland: a preliminary account of its ground pattern features resulting from the action of frost and wind. In Goodier, R. , editor, The natural environment of Shetland, Nature Conservancy Council, Edinburgh, 89-106.

Benedict, J.B. 1970: Downslope soil movement in a Colorado alpine region: rates, processes and climatic significance. Arctic and Alpine Research 2, 165-226.

Carson, M.A. 1978: Slopes and slope processes. Progress in Physical Geography 2, 135-42.

Church, M. 1974: Hydrology and permafrost with reference to northern North America. In Permafrost hydrology, Canadian National Committee, International Hydrological Decade, Environment Canada , 7-20.

Cogley, J.G. 1972: Processes of solution in an arctic limestone terrain . Institute of British Geographers, Special Publication 4, 201-11.

Harris, C. 1974: Autumn, winter and spring soil temperatures in Okstindan, Norway. Journal of Glaciology 13, 521-33.

1977: Engineering properties, groundwater conditions, and the nature of soil movement on a solifluction slope in north Norway. Quarterly Journal of Engineering Geology 10, 27-43.

Hudec, P.P. 1974: Weathering of rocks in arctic and subarctic environments . In Aitken, J.D. and Glass, D.J. , editors, Canadian arctic geology , Geological Association of Canada - Canadian Society of Petroleum Geologists publication, 313-35.

Hutchinson, J.N. 1974: Periglacial solifluxion: an approximate mechanism for clayey soils. Géotechnique 24, 438-43.

Lundqvist, J. 1962: Patterned ground and related frost phenomena in Sweden . Sveriges Geol. Undersökning Arsbok 55. (101 pp.)

Mellor, M. 1970: Phase composition of pore water in cold rocks. US Army Corps of Engineers, Cold Regions Research and Engineering Laboratory , Research Report 292. (61 pp.)

Nakano, Y. and Brown, J. 1972: Mathematical modelling and validation of the thermal regimes in tundra soils, Barrow, Alaska. Arctic and Alpine Research 4, 19-38.

Nicholson, F.H. 1976: Patterned ground formation and description as suggested by low arctic and subarctic examples. Arctic and Alpine Research 8, 329-42.

Potts, A.S. 1970: Frost action in rocks: some experimental data. Transactions of the Institute of British Geographers 49, 109-24.

Rapp. A. 1960: Recent development of mountain slops in Karkevagge and surroundings, northern Scandinavia. Geografiska Annaler 42, 65-200.

Thorn, C.E. 1976: Quantitative evaluation of nivation in the Colorado Front Range. Bulletin of the Geological Society of America 87, 1169-78.

Thorn, C.E. and Hall, K. 1980: Nivation: an arctic-alpine comparison and reappraisal . Journal of Glaciology 25, 109-24.

Washburn, A.L. 1956: Classification of patterned ground and review of suggested origins. Bulletin of the Geological Society of America 67, 823-65.

1973 : Periglacial processes and environments. London: Edward Arnold; New York : St Martins Press. (320 pp.)

White, S.E. 1976: Is frost action really only hydration shattering? A review . Arctic and Alpine Research 8, 1-6.