@misc{indiciaeb7920b2a488c,
  title = {Geologic map of the Bartlett Mountain Quadrangle, Pima and Santa Cruz counties, Arizona},
  author = {Harald Drewes},
  year = {1998},
  doi = {10.3133/i2624},
  url = {https://pubs.usgs.gov/publication/i2624},
  note = {Source identifier: i2624}
}