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Upper Cretaceous ...

Maryland Geological SurveyWilliam Bullock ClarkMarcus Isaac GoldmanEdward Wilber BerryJulia Anna GardnerHenry Augustus PilsbryRay Smith BasslerLloyd William Stephenson

出版	Johns Hopkins Press, 1916
URL	http://books.google.com.hk/books?id=oBm8AAAAIAAJ&hl=&source=gbs_api