@misc{indiciaec1c731ea4018,
  title = {Reconnaissance geologic map of the Dufur quadrangle, Hood River, Sherman, and Wasco Counties, Oregon},
  author = {A. C. Waters},
  year = {1968},
  doi = {10.3133/i556},
  url = {https://pubs.usgs.gov/publication/i556},
  note = {Source identifier: i556}
}