@misc{indiciae83d278ff1de9,
  title = {Map showing thickness of material overlying principal clay unit, Manchester quadrangle, Connecticut},
  author = {W. H. Langer},
  year = {1973},
  doi = {10.3133/mf452e},
  url = {https://pubs.usgs.gov/publication/mf452E},
  note = {Source identifier: mf452E}
}