@misc{indiciaec8643bb4e137,
  title = {Reconnaissance geologic map of the east half of the Crescent quadrangle, Lake, Deschutes, and Crook Counties, Oregon},
  author = {G. W. Walker and N.V. Peterson and R. C. Greene},
  year = {1967},
  doi = {10.3133/i493},
  url = {https://pubs.usgs.gov/publication/i493},
  note = {Source identifier: i493}
}