| Online link | https://doi.org/10.3133/pp1802A |
|---|---|
| Description | An overview of the mineral resource classifications, terms, and definitions used in PP 1802. Includes a review of the history of the use and meaning of the term “critical” applied to minerals or materials. |
| Originators | Schulz, Klaus J., DeYoung, John H. Jr., Bradley, Dwight C., Seal, Robert R. II |
| Publication | U.S. Geological Survey Professional Paper 1802 This publication is available only as a PDF document. |