@misc{indiciaee0a3ecf2c337,
  title = {Mineral resources of the Signal Mountain Wilderness Study Area, Maricopa County, Arizona},
  author = {Floyd Gray and R. J. Miller and J.R. Hassemer and D.H. Knepper and J. A. Pitkin and W. F. Hanna and T. J. Kreidler},
  year = {1989},
  doi = {10.3133/b1702c},
  url = {https://pubs.usgs.gov/publication/b1702C},
  note = {Source identifier: b1702C}
}