@misc{indiciaee468656d1ff7,
  title = {Elkton-Wilmington folio, Maryland-Delaware-New Jersey-Pennsylvania},
  author = {Florence Bascom and Benjamin LeRoy Miller},
  year = {1920},
  doi = {10.3133/gf211},
  url = {https://pubs.usgs.gov/publication/gf211},
  note = {Source identifier: gf211}
}