| Reference List: | Sterrett, Robert B “Gems and Precious Stones”
in Mineral Resources of the United States, Calendar Year 1910
Washington DC 1911
Sterrett, Robert B “Gems and Precious Stones”
in Mineral Resources of the United States, Calendar Year 1911
Washington DC 1912
Sterrett, Robert B “Gems and Precious Stones”
in Mineral Resources of the United States, Calendar Year 1912
Washington DC 1913 |
|---|
