@misc{indiciae10d0ec614a3c,
  title = {Thickness of principal clay unit, Hartford North Quadrangle, Connecticut},
  author = {W. H. Langer},
  year = {1972},
  doi = {10.3133/i784e},
  url = {https://pubs.usgs.gov/publication/i784E},
  note = {Source identifier: i784E}
}