@misc{indiciaeab56149e7eb2,
  title = {Engineering geologic map of the southeastern Copper River basin, Alaska},
  author = {D.R. Nichols and L. A. Yehle},
  year = {1969},
  doi = {10.3133/i524},
  url = {https://pubs.usgs.gov/publication/i524},
  note = {Source identifier: i524}
}