@misc{indiciaea0a74410fb05,
  title = {Map showing resources of coarse aggregate, Broad Brook quadrangle, Connecticut},
  author = {W. H. Langer},
  year = {1973},
  doi = {10.3133/mf451e},
  url = {https://pubs.usgs.gov/publication/mf451E},
  note = {Source identifier: mf451E}
}