@misc{indiciae9435820ed7e4,
  title = {Aeromagnetic map of Littleton and vicinity, New Hampshire and Vermont},
  author = {Randolph Wilson Bromery and F. P. Gilbert},
  year = {1958},
  doi = {10.3133/gp194},
  url = {https://pubs.usgs.gov/publication/gp194},
  note = {Source identifier: gp194}
}