@misc{indiciaefeb5548efaef,
  title = {Map showing distribution, composition, and age of late Cenozoic volcanic centers in Oregon and Washington},
  author = {R. G. Luedke and R. L. Smith},
  year = {1982},
  doi = {10.3133/i1091d},
  url = {https://pubs.usgs.gov/publication/i1091D},
  note = {Source identifier: i1091D}
}