@misc{indiciae41312828efdf,
  title = {Reconnaissance geologic map of the Madras quadrangle, Jefferson and Wasco Counties, Oregon},
  author = {A. C. Waters},
  year = {1968},
  doi = {10.3133/i555},
  url = {https://pubs.usgs.gov/publication/i555},
  note = {Source identifier: i555}
}