TRANSACTIONS OF THE SAN DIEGO SOCIETY OF NATURAL HISTORY Volume XII, No. 3, pp. 31-46 THE FOSSIL PIT-VIPERS (REPTILIA: CROTALIDAE) OF NORTH AMERICA BY Bayard H. Brattstrom Department of Zoology University of California, Los Angeles SAN DIEGO, CALIFORNIA Printed for the Society July 1, 1954 mi COMP. ZOOL JUL 1 6 1954 UNIVERSITY
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