Condon, Steven M., author.
[Washington, D.C.] : U.S. G.P.O. ; Denver, CO : For sale by the Books and Open-File Section, U.S. Geological Survey, Federal Center, 1989.
1989
Stanesco, John D.
[Reston, Va.?] : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : For sale by the Books and Open-File Reports Section, 1991.
1991