@misc{indiciaec5dc82f8c0b0,
  title = {Quaternary geologic map of the Boston 4 degrees x 6 degrees quadrangle, United States and Canada},
  author = {W.B. Thompson and W.F. Chapman and R. F. Black and Gerald Martin Richmond and D.R. Grant and David S. Fullerton},
  year = {1991},
  doi = {10.3133/i1420(nk19)},
  url = {https://pubs.usgs.gov/publication/i1420(NK19)},
  note = {Source identifier: i1420(NK19)}
}