@misc{indiciae25149c415316,
  title = {Map of zones where land use can be affected by landsliding, flooding, and undermining, Allegheny County, Pennsylvania},
  author = {R. P. Briggs and W. R. Kohl},
  year = {1975},
  doi = {10.3133/mf685d},
  url = {https://pubs.usgs.gov/publication/mf685D},
  note = {Source identifier: mf685D}
}