| Online link | https://doi.org/10.3133/ofr02268 |
|---|---|
| Description | A compilation of worldwide mineral deposits of this type. This older version was revised and updated in OFR-2008-1155. |
| Originators | Singer, Donald A., Berger, Vladimir I., Moring, Barry C. |
| Publication | U.S. Geological Survey Open-File Report 2002-268 |