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Publication Citation
| USGS Series | Bulletin |
|---|---|
| Report Number | 725-B |
| Title | Contributions to economic geology, 1921, Part I, Metals and nonmetals except fuels--Chrome ores of southeastern Pennsylvania and Maryland |
| Edition | - |
| Language | ENGLISH |
| Author(s) | Knopf, E. B. |
| Year | 1922 |
| Originating office | |
| USGS Library Call Number | - |
| Physical description | p. 85-139 |
| ISBN |
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