About The Ancient Volcanic Rocks of South Mountain, Pennsylvania

book published in 1896, part of the series U.S. Geological Survey Bulletin; no. 136

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The Ancient Volcanic Rocks of South Mountain, Pennsylvania

book published in 1896, part of the series U.S. Geological Survey Bulletin; no. 136

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book published in 1896, part of the series U.S. Geological Survey Bulletin; no. 136

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Facts from Wikidata (CC0).