INVERTEBRATE PALEONTOLOGY Twenhofel Shrock 1935 Hardcover McGraw Hill
By William H. Twenhofel & Robert R. Shrock. Invertebrate Paleontology. Professor and Asst Professor of Geology & Paleontology University of Wisconsin.
By William H. Twenhofel & Robert R. Shrock. Invertebrate Paleontology. Professor and Asst Professor of Geology & Paleontology University of Wisconsin.