@misc{indiciae29c828ad649a,
  title = {Breccia pipes in the Red Butte area of Kaibab National Forest, Arizona},
  author = {Karen J. Wenrich},
  year = {1992},
  doi = {10.3133/ofr92219},
  url = {https://pubs.usgs.gov/publication/ofr92219},
  note = {Source identifier: ofr92219}
}