TY  - RPRT
TI  - Geologic map and sections of the Helen quicksilver mine, Mayacmas district, Lake County, California
AU  - Lowell S. Hilpert
AU  - James B. Cathcart
PY  - 1943
DO  - 10.3133/ofr4382
UR  - https://pubs.usgs.gov/publication/ofr4382
ID  - ofr4382
ER  -