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1
por Healey, D. L. (Don L.), 1927-
Denver, Colo. : Springfield, Va. : The Survey ; Available from U.S. Dept. of Commerce, N.T.I.S., 1981

Libro
2
por Spengler, Richard W.
Denver, Colo. : Springfield, Va. : The Survey ; Available from N.T.I.S., 1980

Libro
3
[Menlo Park, CA] : U.S. Geological Survey, 2000

Government Document Libro
4
por Bright, Daniel J.
Carson City, Nev. : Denver, CO : U.S. Dept. of the Interior, U.S. Geological Survey ; Information Services [distributor], 2001

Government Document Libro
5
[Denver, CO] : U.S. Geological Survey, 1982

Government Document Libro