TY  - RPRT
TI  - Data set of world phosphate mines, deposits, and occurrences: Part A. Geologic data. Part B. Location and mineral economic data
AU  - Carlotta B. Chernoff
AU  - G. J. Orris
PY  - 2002
DO  - 10.3133/ofr02156
UR  - https://pubs.usgs.gov/publication/ofr02156
ID  - ofr02156
ER  -