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Washington : U.S. G.P.O : For sale by the U.S. G.P.O., Supt. of Docs., Congressional Sales Office, 1991.
1991
V.E. McKelvey Forum on Mineral and Energy Resources (4th : 1988 : Denver, Colo.)
[Reston, Va.?] : Dept. of the Interior, U.S. Geological Survey ; Denver, CO : Free on application to the Books and Open-File Reports Section, 1988.
1988