Mapes, Royal H. And E. J. Benstock.
Published by Journal of Paleontology, Vol. 62, No. 3, 1988, Pp. 439 - 441, 1988
Seller: Eryops Books, Stephenville, TX, U.S.A.
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Used - Softcover
US$ 1.00
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Softcovers reprint/offprint from journal; in very good condition.