Pennsylvania Geological Survey
- Pennsylvania Geological Survey
The first Pennsylvania Geological Survey was created in 1836, making it one of the oldest geological surveys in the United States. It was followed by the Second Survey [ [http://apps.libraries.psu.edu/content/pageo.cfm Penn State University Library] ] , which ran from 1874 to approximately 1895; and the Third Survey, which ran from 1910 to 1919; the fourth survey continues today.
References
External links
* [http://www.dcnr.state.pa.us/topogeo/ Official web site]
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