@misc{indiciae522f28387787,
  title = {Aeromagnetic map of the Popolopen Lake quadrangle, Orange and Rockland Counties, New York},
  author = {G. E. Andreasen and F. C. Smith},
  year = {1962},
  doi = {10.3133/gp340},
  url = {https://pubs.usgs.gov/publication/gp340},
  note = {Source identifier: gp340}
}