History
In total, four surveys have been conducted in the commonwealth. The first survey was created in 1836, making it one of the oldest geological surveys in the United States. It was followed by the Second Survey, which ran from 1874 to approximately 1895; and the Third Survey, which ran from 1910 to 1919. The fourth, and current, survey was created in 1919 and continues today.
Read more about this topic: Pennsylvania Geological Survey
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