Author: Keefer, William Richard, 1924- - Yale University Library GeoBlacklight Search Results

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1. Energy resources map of the Powder River Basin, Wyoming and Montana [cartographic material]

1973. 2013-05-22T17:40:03Z. 2013-06-13T15:35:43Z. Keefer, William Richard, 1924-. Dept. of the Interior, U.S. Geological Survey. English. Public. Powder River Basin (Wyo. and Mont.).

2. Geologic map of the west half of the Neihart 15-minute quadrangle, central Montana

1972. 2012-11-19T15:29:42Z. 2022-12-08T04:41:03Z. Keefer, William Richard, 1924-. U.S. Geological Survey. English. Public. Montana.

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