@misc{indiciae03efc2e98d8d,
  title = {Thickness of material overlying principal clay unit, Hartford North Quadrangle, Connecticut},
  author = {W. H. Langer},
  year = {1972},
  doi = {10.3133/i784f},
  url = {https://pubs.usgs.gov/publication/i784F},
  note = {Source identifier: i784F}
}