TY  - RPRT
TI  - Bibliography of U.S. Geological Survey publications on copper (to January 1, 1952)
AU  - Gwendolyn Werth Luttrell
PY  - 1952
DO  - 10.3133/cir178
UR  - https://pubs.usgs.gov/publication/cir178
ID  - cir178
ER  -