Water Well Journal Pub. Co.,

Wesleyan University Press

American Water Resources Assn.

American Geophysical Union,

Wyoming Water Development Association,

U.S. Dept. of the Interior, Geological Survey,

Agriculture Extension Service, University of Wyoming,

The Center,

W. H. Freeman,

Water Resources Research Institute, University of Wyoming]

[Environmental Protection Agency, Water Quality Office]; for sale by the Supt. of Docs., U.S. Govt. Print. Off.,

U.S. Dept. of the Interior, Geological Survey ; National Technical Information Service, distributor,