John, David A.
[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
Bryant, Bruce, 1930-.
[Reston, Va.?] : Dept. of the Interior, U.S. Geological Survey ; Denver, CO : For sale by the Books and Open-File Reports Section, 1988 [i.e. 1989]
1989