@misc{indiciaecd83c1c06198,
  title = {Geologic map of northeastern United States and adjacent Canada},
  author = {David S. Harwood},
  year = {1979},
  doi = {10.3133/ofr79374},
  url = {https://pubs.usgs.gov/publication/ofr79374},
  note = {Source identifier: ofr79374}
}