TY  - RPRT
TI  - Mineral resources of the United States, 1917: Part II - Nonmetals
AU  - Hiram Dryer McCaskey
AU  - Gerald Francis Loughlin
PY  - 1920
DO  - 10.3133/70175822
UR  - https://pubs.usgs.gov/publication/70175822
ID  - 70175822
ER  -