TY  - RPRT
TI  - Mineral resources of the United States, 1916: Part II - Nonmetals
AU  - Hiram Dryer McCaskey
AU  - Ernest Francis Burchard
AU  - Gerald Francis Loughlin
PY  - 1919
DO  - 10.3133/70175818
UR  - https://pubs.usgs.gov/publication/70175818
ID  - 70175818
ER  -