@misc{indiciae1c8c4c82addb,
  title = {Map showing thickness of material overlying principal clay unit, Hartford South quadrangle, Connecticut},
  author = {William H. Langer},
  year = {1974},
  doi = {10.3133/mf487c},
  url = {https://pubs.usgs.gov/publication/mf487C},
  note = {Source identifier: mf487C}
}