Fairfield Osborn
Norman Hudson
David R. Montgomery
United States. General Accounting Office
Terrence J. Toy
Rattan Lal
Nelson L. Bills
James H. Patric
Richard J. Chorley
Piers Blaikie
Unknown Author
Pierre R. Crosson
Quincy Claude Ayres
Gunnar Rasmusson
China. Shui li bu
João José Bigarella
George E. Dissmeyer
Van Dersal, William Richard
Walter H. Wischmeier