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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