ID:DA0665125X
Hopkins, John A.
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John A. Hopkins, Earl O. Heady
Iowa State University Press c1962 5th ed
Available at 18 libraries
ジョン・A. ホプキンス, アール・O. ヘディ [著] ; 桑原正信 [ほか] 共訳
富民協会出版部 1961.7
Available at 53 libraries
by John Abel Hopkins
Prentice-Hall 1958
Available at 11 libraries
Iowa State University Press 1955 4th ed
Available at 15 libraries
John A. Hopking, William G. Murray
Prentice-Hall c1953 4th ed
by John A. Hopkins
Office of Foreign Agricutural Relations, U.S. Dept. of Agriculture 1950 Foreign agriculture report no. 46
Available at 1 libraries
Iowa State University Press 1949 3. ed
Prentice-Hall c1947 3rd ed
Available at 10 libraries
Collegiate Press [of the Iowa State College] 1942 War Department education manual EM 864
Available at 4 libraries
U.S. G.P.O. 1941
Available at 2 libraries
Prentice-Hall 1940 Rev. ed
by Eugene G. McKibben, John A. Hopkins and R. Austin Griffin
Work Projects Administration, National Research Project 1939 Report no. A-11 . Studies in types and rates of technological change ; agriculture . Change in farm power and equipment
Prentice-Hall 1936
John A. Hopkins, Jr
Delaware College Agricultural Experiment Station 1918 Bulletin / Agricultural Experiment Station, University of Delaware no. 118
