Twenhofel, William H. 1875-1957.
Principles of invertebrate paleontology / Robert R. Shrock [and] William H. Twenhofel. - 2d ed. - New York : McGraw-Hill, 1953. - xx, 816 p. : illus. ; 24 cm. - McGraw-Hill series in geology .
Includes bibliographical references and index.
52005341
Invertebrates, Fossil.
QE770 / .T8 1953
562 / SHP
Principles of invertebrate paleontology / Robert R. Shrock [and] William H. Twenhofel. - 2d ed. - New York : McGraw-Hill, 1953. - xx, 816 p. : illus. ; 24 cm. - McGraw-Hill series in geology .
Includes bibliographical references and index.
52005341
Invertebrates, Fossil.
QE770 / .T8 1953
562 / SHP