@misc{indiciaec972a09ce100,
  title = {Map showing thickness of principal clay unit, Windsor Locks quadrangle, Connecticut},
  author = {W. H. Langer},
  year = {1974},
  doi = {10.3133/mf450c},
  url = {https://pubs.usgs.gov/publication/mf450C},
  note = {Source identifier: mf450C}
}