@misc{indiciae3ed22efc2ebc,
  title = {Deterioration of building stones in Washington, DC; a field trip guide},
  author = {E. S. McGee},
  year = {1990},
  doi = {10.3133/ofr90479},
  url = {https://pubs.usgs.gov/publication/ofr90479},
  note = {Source identifier: ofr90479}
}