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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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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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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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