Bureau of Agricultural Economics.Report of the Chief of the Bureau of Agricultural Economics, 1933, page 22.
2.
H.B. Richardson , T.L.W. Bailey, Jr. and C.M. Conrad. "Methods for the measurement of certain character properties of raw cotton." Technical Bulletin 545, U. S. Department of Agriculture, 1937; see also ASTM Standards on Textile Materials, prepared by Committee D-13, on Textile Materials, American Society for Testing Materials, 306 pp., 1937, pp. 57-69.
3.
C.M. Conrad and Robert W. Webb. "The problem of character standardization in American raw cotton." Mimeographed preliminary report. U. S. Department of Agriculture, 1935.
4.
C.M. Conrad and Robert W. Webb. "Fineness and maturity are important elements in cotton fibre quality." Yearbook of Agriculture, 1935. U. S. Department of Agriculture, pages 198-202.
5.
J.I. Hardy. "A practical laboratory method for making thin cross sections of fibres." Circular378. U. S. Department of Agriculture, 1935.
6.
F.A. Mennerich . "A rapid microscopical measurement of diameters in cross-section." Text. Rsch., 6, 217-22 (1936).