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By: Woodland, Bertram G.Edition:Publication info: Chicago, Chicago Natural History Museum Press, 1964Volume: v.13:no.4 (1964)Series:Holding Institution: University Library, University of Illinois Urbana ChampaignSubjects: ConcretionsBHL Collections:
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By: Nichols, Henry W. (Henry Windsor), - Farrington, Oliver C. (Oliver Cummings), - Field Columbian Museum.Edition:Publication info: Chicago, Field Columbian Museum, 1906Volume: v.3:no.3 (1906)Series:Holding Institution: University Library, University of Illinois Urbana ChampaignSubjects: ConcretionsBHL Collections:
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By: Woodland, Bertram G.Edition:Publication info: Chicago, Field Museum of Natural History, 1975Volume: v.33:no.7 (1975)Series:Holding Institution: University Library, University of Illinois Urbana ChampaignSubjects: Concretions Geology, Stratigraphic Middle west Pennsylvanian PyritesBHL Collections: