@misc{indiciaeca39d641dc35,
  title = {Preliminary materials map, Blandford quadrangle, Massachusetts},
  author = {George William Holmes},
  year = {1968},
  doi = {10.3133/ofr68130},
  url = {https://pubs.usgs.gov/publication/ofr68130},
  note = {Source identifier: ofr68130}
}