United States. Engineer Agency for Resources Inventories.
International Workshop on Earth Resources Survey Systems Washington, D.C. 1971.
International Workshop on Earth Resources Survey Systems (1971 University of Michigan)
R. N. Cunliffe
V. R. Booth
A. J. C. Buchan
Ned Trovillion
United States. Natural Resources Conservation Service
Unknown Author
United States. Congress. Senate. Committee on Public Works.
United States Geological Survey
Raymond F. Mikesell