TY  - RPRT
TI  - Sixteenth Annual report of the United States Geological Survey to the Secretary of the Interior, 1894-1895: Part 4 -- Mineral Resources of the United States, 1894, Nonmetallic Products
AU  - Charles D. Walcott
PY  - 1896
DO  - 10.3133/ar16
UR  - https://pubs.usgs.gov/publication/ar16
ID  - ar16
ER  -