TY  - RPRT
TI  - The Permian phosphorite deposits of western United States
AU  - Vincent Ellis McKelvey
AU  - Roger Warren Swanson
AU  - Richard Porter Sheldon
PY  - 1952
DO  - 10.3133/tei263
UR  - https://pubs.usgs.gov/publication/tei263
ID  - tei263
ER  -