Steven Piper
B. E. Allison
J. Rutin
Karlheinz Michels
Canada. Agriculture Canada
E. L. Skidmore
A. Bocharov
Ḥusayn Qulī Rafāhī
Peter Schlyter
Lake States Forest Experiment Station (Saint Paul, Minn.)
United States. Agricultural Research Service. Soil and Water Conservation Research Division
Elena Andreevna Chakvetadze
N. V. Orlovskiĭ
United States. Natural Resources Conservation Service
C.E. Van Doren
Newvine Carole Madelaine
E. E. Free
Kirk Bryan
Unknown Author
Fedir Trokhymovych Morhun