@misc{indiciae9e1508faca35,
  title = {Map Showing Metallic Mineral Deposits of Colorado 1946},
  author = {Richard P. Fischer and Wilbur Burbank and Hallen Cannon and and others},
  year = {1946},
  doi = {10.3133/mb8},
  url = {https://pubs.usgs.gov/publication/mb8},
  note = {Source identifier: mb8}
}