@misc{indiciae5014ed6fb5ce,
  title = {Preliminary geologic map of the Nulato and Kateel Rivers area, Alaska},
  author = {Robert Samuel Bickel and William Wallace Patton},
  year = {1956},
  doi = {10.3133/ofr568},
  url = {https://pubs.usgs.gov/publication/ofr568},
  note = {Source identifier: ofr568}
}