| Author: | Geological Survey (U.S.) |
| Subject: | QE, Precious stones -- United States, Gems -- United States, Precious stones -- Collection and preservation -- United States |
| Format: | Text |
| Date issued: | 2015 |
| Language: | English |
| Publisher: | Project Gutenberg, |
| Rights: | Public domain in the USA. |
| Download link: | Natural Gemstones [electronic resource] / Geological Survey |