| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Gravity and Aeromagnetic Studies of the Powder River Basin and Surrounding Areas, Southeastern Montana, Northeastern Wyoming, and Western South dakota | 978-99938-O-831-2 (99938-O-831-8) | 1994 |
L. R. · S. L. · S R · S. Robbins · Stephen L · Stephen R. · Stephen Robbins