TY  - RPRT
TI  - Twenty-First Annual report of the Director of the United States Geological Survey, 1899-1900: Part II - General geology, economic geology, Alaska
AU  - Charles D. Walcott
PY  - 1900
DO  - 10.3133/ar21_2
UR  - https://pubs.usgs.gov/publication/ar21_2
ID  - ar21_2
ER  -