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 WHEN | REFINE  Browse All : Geology of Maryland and Washington (D.C.)
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       Author Tyson, Philip T. Full Title Map of Maryland and the District of Columbia, colored to illustrate the geological formations by Philip T. Tyson. L.E. Neuman, eng. , 36 Vesey St., N.Y. (Published by Stedman, Brown & Lyon, Baltimore. 1873) Publisher Stedman, Brown & Lyon 
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