@misc{indiciaeee28c9503c39,
  title = {Aeromagnetic map of the Colrain quadrangle, Franklin County, Massachusetts, and Windham County, Vermont},
  author = {G. E. Andreasen and G.E. Zandle},
  year = {1963},
  doi = {10.3133/gp431},
  url = {https://pubs.usgs.gov/publication/gp431},
  note = {Source identifier: gp431}
}