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Center County

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    An attempt to determine the amount and rate of chemical erosion taking place in the limestone (Calciferous to Trenton) valley of Center County, Pennsylvania.
    A. L. Ewing
    American Journal of Science January 1885, s3-29 (169) 29-31; DOI: https://doi.org/10.2475/ajs.s3-29.169.29

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