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1Published 1980“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Conference Proceeding Book -
2by Bortz, Seymour A., 1922-“...U.S. Dept. of the Interior, Bureau of Mines,...”
Published 1982
Government Document Conference Proceeding Book -
3Published 1981“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Conference Proceeding Book -
4Published 1982“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Conference Proceeding Book -
5Published 1981“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Conference Proceeding Book -
6Published 1981“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Conference Proceeding Book -
7Published 1981“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Conference Proceeding Book -
8Published 1981“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Conference Proceeding Book -
9Published 1981“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Conference Proceeding Book -
10Published 1982“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Conference Proceeding Book -
11Published 1983“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Conference Proceeding Book -
12Published 1984“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Conference Proceeding Book -
13Published 1984“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Conference Proceeding Book -
14Published 1985“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Conference Proceeding Book -
15Published 1984“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Conference Proceeding Book -
16Published 1985“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Conference Proceeding Book -
17Published 1985“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Conference Proceeding Book -
18Published 1987“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Conference Proceeding Book -
19Published 1987“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Conference Proceeding Book -
20Published 1988“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Conference Proceeding Book