@misc{indiciae08502a531821,
  title = {Mapoteca geologica americana, a catalogue of geological maps of America (North and South), 1752-1881, in geographic and chronologic order},
  author = {Jules Marcou and John Belknap Marcou},
  year = {1884},
  doi = {10.3133/b7},
  url = {https://pubs.usgs.gov/publication/b7},
  note = {Source identifier: b7}
}