@misc{indiciae41aed2609b50,
  title = {Atlantic Continental Shelf and Slope of the United States - Nineteenth century exploration},
  author = {T.J.M. Schopf},
  year = {1968},
  doi = {10.3133/pp529f},
  url = {https://pubs.usgs.gov/publication/pp529F},
  note = {Source identifier: pp529F}
}