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  1. The nature and origin of cone-in-cone structure /
    By: Woodland, Bertram G.
    Publication info: Chicago :Chicago Natural History Museum Press ,1964.
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Concretions  
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  2. New forms of concretions /
    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  
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  3. Pyritic cone-in-cone concretions /
    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  
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