@misc{indiciae4e73453c480e,
  title = {Map showing distribution, composition, and age of late Cenozoic volcanic centers in the western conterminous United States},
  author = {R. G. Luedke and R. L. Smith},
  year = {1984},
  doi = {10.3133/i1523},
  url = {https://pubs.usgs.gov/publication/i1523},
  note = {Source identifier: i1523}
}