1.
|
[Denver, Colo.] : U.S. Dept. of the Interior, U.S. Geological Survey, 2000.
I 19.76: 00-116 |
|
2.
|
[Reston, Va.] : The Survey, 1999.
I 19.76: 99-20-A |
|
3.
|
Arlington, Va. : U.S. Geological Survey, 1976.
|
4.
|
Tulsa, Okla. : Society of Economic Paleontologists and Mineralogists, 1980.
|
5.
|
Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines,
HD9585.P48 P46 |
|
6.
|
Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines,
|
7.
|
[Reston, Va.] : Dept. of the Interior, U.S. Geological Survey, 1985.
|
8.
|
Washington, D.C. : U.S. G.P.O. ; Denver, CO : For sale by the Books and Open-File Reports Section, U.S. Geological Survey, 1986.
|