Principles of invertebrate paleontology Invertebrate paleontology Twenhofel, William H. (William Henry) 1875-1957 creator Shrock, Robert R. (Robert Rakes) 1904-1993 joint author. text nyu New York McGraw-Hill 1953 2d ed. monographic eng
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xx, 816 p. : illus. ; 24 cm. [by] Robert R. Shrock [and] William H. Twenhofel. "A revised and enlarged edition of Twenhofel and Shrock, Invertebrate paleontology." Invertebrates, Fossil QE770 .T8 1953 562 SHP McGraw-Hill series in geology 52005341 DLC 790516 20141117104758.0 2164500