@misc{indiciae9e12e5abb3ea,
  title = {Map showing resources of coarse aggregate, Springfield South Quadrangle, Massachusetts-Connecticut},
  author = {Carl Koteff},
  year = {1973},
  doi = {10.3133/mf509b},
  url = {https://pubs.usgs.gov/publication/mf509B},
  note = {Source identifier: mf509B}
}