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Pennsylvanian Spores of Illinois and Their Use in Correlation

James Marvin WellerLeland HorbergRobert Max KosankeRobert Mann GroganFrank Emerson Tippie

出版	State Geological Survey, 1950
URL	http://books.google.com.hk/books?id=RqGCuwEACAAJ&hl=&source=gbs_api