| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| The study of trace fossils: A synthesis of principles, problems, and procedures in ichnology | 978-O-387-O687O-1 (O-387-O687O-8) | 1975 |
R. F. · R. Frey · R.W. Frey · Robert F. · Robert Frey · Robert W. · W F · W. Frey