@misc{indiciae0a1b6128d90f,
  title = {Bedrock geologic map of the Williamstown and North Adams quadrangles, Massachusetts and Vermont, and part of the Cheshire Quadrangle, Massachusetts},
  author = {N. M. Ratcliffe and D.B. Potter and R. S. Stanley},
  year = {1993},
  doi = {10.3133/i2369},
  url = {https://pubs.usgs.gov/publication/i2369},
  note = {Source identifier: i2369}
}