C. G. · C.S. · G S · Geological Survey
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Bulletin - Colorado Geological Survey, Issue 13 | 978-1-377-67059-1 (1-377-67059-7) | 2018 |
| First Report, 1908, with Accompanying Papers | 978-1-145-39017-1 (1-145-39017-X) | 2010 |