@misc{indiciae083dd2d418dd,
  title = {Contour map of the bedrock surface, Mount Holyoke Quadrangle, Massachusetts},
  author = {C.J. Londquist},
  year = {1975},
  doi = {10.3133/mf640a},
  url = {https://pubs.usgs.gov/publication/mf640A},
  note = {Source identifier: mf640A}
}