@misc{indiciaedf4a475b93ca,
  title = {Topographic mapping status and progress of operations: (7 1/2- and 15-minute series)},
  author = {U.S. Geological Survey},
  year = {1977},
  doi = {10.3133/70203438},
  url = {https://pubs.usgs.gov/publication/70203438},
  note = {Source identifier: 70203438}
}