Agricultural Development and Advisory Service.
Mari C. Schuh
W. Fraser Rae
Michele A. Jordan
H. M. C. van Holsteijn
United States. General Accounting Office. General Government Division.
Organization for Economic Co-operation and Development
Sidney Samuel Hoos
William H. Friedland
United States. Agricultural Marketing Service.
United States. Agricultural Research Service.
John M. Harvey
Paris. Institut national de la recherche agronomique. Service d'expérimentation et d'information.
Heinrich Hirschfeld
Unknown Author
Stanley S. Rogers
Jones, Henry Albert
J. E. Knott
H. D. Locklin