Author: Hansen, Wallace R., 1920- / Year: 1968 - Yale University Library GeoBlacklight Search Results

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1. Geologic map of the Black Ridge quadrangle, Delta and Montrose Counties, Colorado [cartographic material]

1968. 2012-02-17T19:59:45Z. 2012-03-05T17:41:32Z. Hansen, Wallace R., 1920-. The Survey. English. Public. Colorado, Delta County, and Montrose County.

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1. Geologic map of the Black Ridge quadrangle, Delta and Montrose Counties, Colorado [cartographic material]

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