TY  - RPRT
TI  - Twenty-First Annual report of the Director of the United States Geological Survey, 1899-1900: Part VI(continued)- Mineral Resources of the United States, 1899 Nonmetallic Products, Except Coal and Coke
AU  - Charles D. Walcott
PY  - 1901
DO  - 10.3133/ar21_6continued
UR  - https://pubs.usgs.gov/publication/ar21_6continued
ID  - ar21_6continued
ER  -