TY  - RPRT
TI  - Progress report on investigations of western phosphate deposits
AU  - Roger Warren Swanson
AU  - Vincent Ellis McKelvey
AU  - Richard Porter Sheldon
PY  - 1953
DO  - 10.3133/cir297
UR  - https://pubs.usgs.gov/publication/cir297
ID  - cir297
ER  -