लेखक
Argentina. Ministerio de Agricultura
1
Argentina. Ministerio de Agricultura y Ganadería
1
Butts, H. H.
1
Ehlers, Carrol W.
1
Gulf States Farmer Pub. Co
1
Japan. Naimush̄o. Chih̄okyoku
1
Louisiana. Dept. of Agriculture and Immigration
1
Lundberg, Stellan
1
Lunds universitet
1
Montana. Dept. of Agriculture and Publicity
1
Montana. Dept. of Agriculture, Labor, and Industry
1
Peru. Ministerio de Fomento
1
Pezet, F. A. (Frederico Alfonso)
1