TY  - RPRT
TI  - Virgin Valley opal district, Humboldt County, Nevada
AU  - Mortimer Hay Staatz
AU  - Herman L. Bauer
PY  - 1951
DO  - 10.3133/cir142
UR  - https://pubs.usgs.gov/publication/cir142
ID  - cir142
ER  -