@misc{indiciae458a87031eb5,
  title = {Newly recognized en echelon fall lines in the Piedmont and Blue Ridge provinces of North Carolina and Virginia; with a discussion of their possible ages and origins},
  author = {R. E. Weems},
  year = {1998},
  doi = {10.3133/ofr98374},
  url = {https://pubs.usgs.gov/publication/ofr98374},
  note = {Source identifier: ofr98374}
}