Pennsylvania Geological Survey

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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[1], which ran from 1874 to approximately 1895; and the Third Survey, which ran from 1910 to 1919; the fourth survey continues today.

[edit] References

  1. ^ Penn State University Library

[edit] External links

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