1.
|
[Denver, CO] : U.S. Dept. of the Interior, Geological Survey, 1990.
i 19.76: 90-504 |
|
2.
|
Denver, CO : U.S. Geological Survey : [Books and Open-File Reports Section, distributor, 1992]
I 19.76: 92-219 |
|
3.
|
Washington : U.S. G.P.O., 1997.
|
4.
|
Denver, CO : U.S. Dept. of the Interior, Geological Survey : [Books and Open-File Reports Section, distributor], 1990.
I 19.76: 90-15 |
|
5.
|
[Denver, Colo.?] : U.S. Dept. of the Interior, U.S. Geological Survey : [Open-File Reports Section, distributor], 1994.
I 19.76: 93-619 |
|
6.
|
[Menlo Park, Calif.?] : U.S. Dept. of the Interior, U.S. Geological Survey ; [Denver, Colo. : Open-File Reports Section, distributor, 1994?]
I 19.76: 94-417 |
|
7.
|
[Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey ; [Denver, Colo. : Books and Open-File Reports Section, distributor, 1994]
I 19.76: 94-566 |
|