by I.A. Denison, Wiliam H. Fry and P.L. Gile

U.S. Government Printing Office : United States Department of Agriculture 1929 Technical bulletin / United States Department of Agriculture No. 128

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prepared by the Commodity Exchange Administration

U.S. G.P.O. 1931- Statistical bulletin / United States Department of Agriculture 1921-29 : no.34, 1930-33 : no.43, 1933-35 : no.55, 1939-39 : no.74

1921-1929 , 1930-1932 , 1933-1935 , 1936-1939

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prepared by the Bureau of Agricultural Economics

U.S. Dept. of Agriculture , For sale by the Superintendent of Documents 1929- Statistical bulletin / United States Department of Agriculture no. 27, 35, 42, 61

1926/1927 , 1928/1929 , 1930/1931 , 1934/1935

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by John J. Scanlan and J. M. Tinley

United States. Dept. of Agriculture : Government Printing Office 1929 Circular / United States Department of Agriculture no. 100

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by J. W. Park

United States. Dept. of Agriculture : Government Printing Office 1929 Circular / United States Department of Agriculture no. 91

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by T. B. Manny

United States. Dept. of Agriculture : Government Printing Office 1929 Circular / United States Department of Agriculture no. 87

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by Rudolph K. Froker and H. Bruce Price

United States. Dept. of Agriculture : Government Printing Office 1929 Circular / United States Department of Agriculture no. 80

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by Thomas W. Heitz

United States. Dept. of Agriculture 1929 Circular / United States Department of Agriculture no. 73

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prepared by the Forest Service

U.S.G.P.O. 1928 Statistical bulletin / United States Department of Agriculture no. 21