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Poughkeepsie region

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    Recent explorations in the Wappinger Valley limestone of Dutchess County, New York; no. 5, Discovery of fossiliferous Potsdam strata at Poughkeepsie, New York
    William Buck Dwight
    American Journal of Science February 1886, s3-31 (182) 125-133; DOI: https://doi.org/10.2475/ajs.s3-31.182.125
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    On the age of the clay slates and grits of Poughkeepsie
    Thomas Nelson Dale
    American Journal of Science January 1879, s3-17 (97) 57-59; DOI: https://doi.org/10.2475/ajs.s3-17.97.57

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