@misc{indiciae1fa12237cac7,
  title = {Preliminary materials map, Otis quadrangle, Massachusetts},
  author = {George William Holmes},
  year = {1965},
  doi = {10.3133/ofr6574},
  url = {https://pubs.usgs.gov/publication/ofr6574},
  note = {Source identifier: ofr6574}
}