TY  - RPRT
TI  - Twentieth Annual report of the United States Geological Survey, 1898-1899: Part III - Precious-metal mining districts
AU  - Charles D. Walcott
PY  - 1900
DO  - 10.3133/ar20_3
UR  - https://pubs.usgs.gov/publication/ar20_3
ID  - ar20_3
ER  -