Author: Pennsylvania. Bureau of Topographic and Geologic Survey / Subject: Geology - Yale University Library GeoBlacklight Search Results

Start Over Author Pennsylvania. Bureau of Topographic and Geologic Survey Subject Geology

1. Geologic map of Pennsylvania

1980. 2012-10-22T13:34:45Z. 2012-10-22T13:34:45Z. Pennsylvania. Bureau of Topographic and Geologic Survey. The Survey. English. Public. Pennsylvania.

2. Map of the Mercer clay and adjacent units in Clearfield, Centre, and Clinton Counties, Pennsylvania [cartographic material]

1964. 2018-04-17T20:15:13Z. 2018-09-05T19:41:47Z. Pennsylvania. Bureau of Topographic and Geologic Survey. Pennsylvania Bureau of Topographic and Geologic Survey. English. cartographic image. Public. Pennsylvania, Clearfield County, Centre County, Clinton County, Centre County., Clearfield County., and Clinton County.