1.
|
[Denver, Colo.?] : The Survey : [Books and Open-File Reports Section, distributor], 1990.
I 19.76: 90-490 |
|
2.
|
[Denver, Colo.] : U.S. Geological Survey : [Books and Open-File Reports Section, distributor, 1991]
I 19.76: 90-505 |
|
3.
|
[Denver, Colo.?] : The Survey : [Books and Open-File Reports Section, distributor], 1990.
I 19.76: 90-423 |
|
4.
|
[Denver, Colo.] : The Survey : [Books and Open-File Reports Section, distributor], 1990.
I 19.76: 90-240 |
|
5.
|
[Denver, Colo.] : U.S. Geological Survey, [1991]
I 19.76: 90-252 |
|
6.
|
[Denver, Colo.?] : The Survey : [Books and Open-File Reports Section, distributor], 1990.
I 19.76: 90-425 |
|
7.
|
[Reston, Va.?] : The Survey ; [Denver, Colo. : Books and Open-File Reports Section, distributor], 1995.
I 19.76: 95-263 |
|