@misc{indiciae9d2d1d30f8f0,
  title = {Map showing location of sand, gravel, and till pits and quarries in the Rockville quadrangle, Connecticut},
  author = {Roger B. Colton and Michael J. Mallory},
  year = {1969},
  doi = {10.3133/ofr6958},
  url = {https://pubs.usgs.gov/publication/ofr6958},
  note = {Source identifier: ofr6958}
}