Spruill, T. B.
[Reston, Va.?] : Dept. of the Interior, U.S. Geological Survey ; Denver, CO : For sale by the Books and Open-File Reports Section, 1987.
1987
Bevans, Hugh E.
[Washington] : U.S. Dept. of the Interior, U.S. Geological Survey : U.S. G.P.O. ; Denver, CO : For sale by U.S. Geological Survey, Information Services, 1995.
1995
Pope, Larry M.
[Reston, Va.?] : Dept. of the Interior, U.S. Geological Survey,; Denver, CO : For sale by the Books and Open-File Reports Section, 1987.
1987