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  1. By: Woodland, Bertram G.
    Publication info: Chicago, Chicago Natural History Museum Press, 1964
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Concretions  
  2. By: Nichols, Henry W. (Henry Windsor), - Farrington, Oliver C. (Oliver Cummings), - Field Columbian Museum.
    Publication info: Chicago, Field Columbian Museum, 1906
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Concretions  
  3. By: Woodland, Bertram G.
    Publication info: Chicago, Field Museum of Natural History, 1975
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Concretions  Geology, Stratigraphic  Middle west  Pennsylvanian  Pyrites