Shrock, Robert R.
Principles of Invertebrate paleontology / Robert R. Shrock and William H. Twenhofel. - 2nd ed. - London : McGraw-Hill Book, c 1953. - 816 p. : ill. ; 22 cm.
Includes index.
Includes bibliographical references.
327 327
Fossil invertebrates.
562 / S87r
Principles of Invertebrate paleontology / Robert R. Shrock and William H. Twenhofel. - 2nd ed. - London : McGraw-Hill Book, c 1953. - 816 p. : ill. ; 22 cm.
Includes index.
Includes bibliographical references.
327 327
Fossil invertebrates.
562 / S87r