TY  - RPRT
TI  - Mineral resources of the United States, 1921: Part II - Nonmetals
AU  - Gerald Francis Loughlin
AU  - Frank James Katz
PY  - 1924
DO  - 10.3133/70175846
UR  - https://pubs.usgs.gov/publication/70175846
ID  - 70175846
ER  -