|
USA | |
| [var. Agate] Ref: Earth Treasures Vol 4, Allan W. Eckert, 1987 |
| [var. Agate] Earth Treasures Vol 4, Allan W. Eckert, 1987 |
| [var. Agate] Earth Treasures Vol 4, Allan W. Eckert, 1987 |
| Johnson, E.R.: Source Book For the Rock & Mineral Collector, 1960 |
| [var. Agate] Earth Treasures Vol 4, Allan W. Eckert, 1987 |
| [var. Agate] Earth Treasures Vol 4, Allan W. Eckert, 1987 |
| [var. Agate] Earth Treasures Vol 4, Allan W. Eckert, 1987 |
| [var. Agate] Earth Treasures Vol 4, Allan W. Eckert, 1987 |
| [var. Agate] Earth Treasures Vol 4, Allan W. Eckert, 1987 |
| [var. Agate] Earth Treasures Vol 4, Allan W. Eckert, 1987 |
| [var. Agate] Earth Treasures Vol 4, Allan W. Eckert, 1987 |
| [var. Carnelian] Ransom, 1974. Gems and Minerals of America |
| [var. Agate] Jay Ellis Ransom,1974, Gems and Minerals of America |
| [var. Agate] MacFall (1975) Gem Hunter's Guide |
| [var. Agate] R&M 69:3 pp 156-162 |
| [var. Agate] MacFall (1975) Gem Hunter's Guide |