TY  - RPRT
TI  - Mineral resources of the United States, 1918: Part II - Nonmetals
AU  - Gerald Francis Loughlin
AU  - Ralph Walter Stone
PY  - 1921
DO  - 10.3133/70175826
UR  - https://pubs.usgs.gov/publication/70175826
ID  - 70175826
ER  -