@misc{indiciaedfb6a7f1edb1,
  title = {Bibliography of U.S. Geological Survey publications on copper (to January 1, 1952)},
  author = {Gwendolyn Werth Luttrell},
  year = {1952},
  doi = {10.3133/cir178},
  url = {https://pubs.usgs.gov/publication/cir178},
  note = {Source identifier: cir178}
}