TY  - RPRT
TI  - Mineral resources of the United States, 1915: Part II - Nonmetals
AU  - Hiram Dryer McCaskey
AU  - Ernest Francis Burchard
PY  - 1917
DO  - 10.3133/70175815
UR  - https://pubs.usgs.gov/publication/70175815
ID  - 70175815
ER  -