United States. Bureau of Plant Industry
W. Lopushinsky
R. A. Oakley
Roland Bieri
John L. Schwendiman
David L. West
Elmer Henry Stobbe
Hans Joachim Von Amsberg
Unknown Author
Coulson, John
F. C. Newton
Vaughan Wood
John Lee Kugler
United States. Bureau of Agricultural Economics
N. P. Kholopt͡seva
Jesus Perez Fernandez
Troy Downing
ʻAbd al-Razzāq al-Ṣādiq Sharīf
D. B. Hannaway