Author: Ping, Russell G. / Year: 1978 - Yale University Library GeoBlacklight Search Results

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1978. 2012-06-20T13:39:04Z. 2012-06-29T20:46:12Z. Ping, Russell G. U.S. Geological Survey. English. Public. Kentucky and Knox County.

1978. 2012-06-20T13:35:01Z. 2012-06-29T20:46:11Z. Ping, Russell G. U.S. Geological Survey. English. Public. Kentucky, Clay County, and Knox County.

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