TY  - RPRT
TI  - The Nature and Use of Copper Reserve and Resource Data
AU  - Dennis P. Cox
AU  - Nancy A. Wright
AU  - George J. Coakley
PY  - 1981
DO  - 10.3133/pp907f
UR  - https://pubs.usgs.gov/publication/pp907F
ID  - pp907F
ER  -