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1
[Washington, D.C.] : Denver, CO : U.S. G.P.O. ; Books and Open-File Reports Section, U.S. Geological Survey, 1987

Government Document Conference Proceeding Book
2
Cambridge, Mass. : Ballinger Pub. Co., 1986

Conference Proceeding Book
3
Lexington, Ky. : University Press of Kentucky, 1991

Conference Proceeding Book
4
New York : Greenwood Press, 1988

Conference Proceeding Book