@misc{indiciaedfd2873510c1,
  title = {Surficial alteration at the Cathedral of Learning in Pittsburgh, Pennsylvania},
  author = {E. S. McGee},
  year = {1997},
  doi = {10.3133/ofr97275},
  url = {https://pubs.usgs.gov/publication/ofr97275},
  note = {Source identifier: ofr97275}
}