@misc{indiciae47d84cf0f324,
  title = {Cycles of erosion in the Piedmont Province of Pennsylvania},
  author = {Florence Bascom},
  year = {1921},
  doi = {10.1086/622809},
  url = {https://pubs.usgs.gov/publication/70241194},
  note = {Source identifier: 70241194}
}