TY  - RPRT
TI  - Critical mineral resources of the United States—An introduction
AU  - Klaus J. Schulz
AU  - John H. DeYoung
AU  - Robert R. Seal
AU  - Dwight Bradley
PY  - 2017
DO  - 10.3133/pp1802a
UR  - https://pubs.usgs.gov/publication/pp1802A
ID  - pp1802A
ER  -