TY  - RPRT
TI  - Porphyry copper deposits of the world: Database, maps, and preliminary analysis
AU  - Donald A. Singer
AU  - Vladimir I. Berger
AU  - Barry C. Moring
PY  - 2002
DO  - 10.3133/ofr02268
UR  - https://pubs.usgs.gov/publication/ofr02268
ID  - ofr02268
ER  -