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  1. The nature and origin of cone-in-cone structure / Bertram G. Woodland --
    By: Woodland, Bertram G.
    Publication info: Chicago :Chicago Natural History Museum Press ,1964.
    Contributed by: University of Illinois Urbana Champaign
    Subjects: Concretions  
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  2. New forms of concretions / by Henry Windsor Nichols -- ; Oliver Cummings Farrington --
    By: Nichols, Henry W. - Farrington, Oliver C. - Field Columbian Museum.
    Publication info: Chicago :Field Columbian Museum ,1906.
    Contributed by: University of Illinois Urbana Champaign
    Subjects: Concretions  
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  3. Pyritic cone-in-cone concretions / Bertram G. Woodland --.
    By: Woodland, Bertram G.
    Publication info: Chicago :Field Museum of Natural History,1975.
    Contributed by: University of Illinois Urbana Champaign
    Subjects: Concretions  Geology, Stratigraphic  Middle west  Pennsylvanian  Pyrites  
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