Pennsylvania Geological Survey について

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Pennsylvania Geological Survey ：ウィキペディア英語版

Pennsylvania Geological Survey
The Pennsylvania Geological Survey or Bureau of Topographic and Geologic Survey (BTGS), is a geological survey enacted by the Pennsylvania General Assembly "to serve the citizens of Pennsylvania by collecting, preserving, and disseminating impartial information on the Commonwealth's geology, geologic resources, and topography in order to contribute to the understanding, wise use, and conservation of its land and included resources."〔(Pennsylvania Geological Survey: Mission Statement )〕 The geological survey operates under the Pennsylvania Department of Conservation and Natural Resources.
== 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,〔(Penn State University Library )〕 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.

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