G.B. · G. Butler · Gail A. Butler · Gail F. Butler
Gem Guides Book Co · Globe Pequot
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Crystal & Gemstone Divination | 978-1-889786-42-1 (1-889786-42-X) | 2008 |
| Recreational Gold Prospecting for Fun & Profit | 978-0-935182-98-9 (0-935182-98-5) | 1998 |
| Rockhounding California | 978-0-7627-1965-5 (0-7627-1965-6) | 2001 |