TY  - RPRT
TI  - Map and list of reported occurrences of platinum-group metals in the conterminous United States
AU  - W.N. Blair
AU  - N.J. Page
AU  - M. G. Johnson
PY  - 1977
DO  - 10.3133/mf861
UR  - https://pubs.usgs.gov/publication/mf861
ID  - mf861
ER  -