1.
|
Helena, MT : U.S. Geological Survey ; Denver, CO : U.S. Geological Survey, Earth Science Information Center, Open-File Reports Section [distributor], [1993]
I 19.76: 93-131 |
|
2.
|
Helena, Mont. : U.S. Geological Survey ; Denver, CO : Branch of Information Services [distributor], 1998.
I 19.76: 98-173 |
|
3.
|
Helena, Mont. : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, Colo. : Branch of Information Services [distributor, 1999]
TD224.M9 D6424 1999 |
|
4.
|
Helena, Mont. : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, Colo. : Branch of Information Services [distributor, 1996]
I 19.76: 96-432 |
|
5.
|
Helena, Mont. : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, Colo. : Branch of Information Services [distributor, 1998]
I 19.76: 98-407 |
|
6.
|
Helena, Mont. : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, Colo. : Branch of Information Services [distributor], 1997.
I 19.76: 97-552 |
|