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1
by Conkin, James Elvin, Conkin, Barbara M.
Louisville, Ky., University of Louisville Reproduction Services, 1973
[1st ed.
Louisville, Ky., University of Louisville Reproduction Services, 1973
[1st ed.
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2
by Orr, Robert William
Urbana, Ill. : Illinois State Geological Survey, 1964
Urbana, Ill. : Illinois State Geological Survey, 1964
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