@misc{indiciaee142b8ae470a,
  title = {Aeromagnetic map of the Rockville quadrangle, Montgomery County, Maryland, and Fairfax County, Virginia},
  author = {Jean Blanchett and N.S. Tyson and E.F. McGowan},
  year = {1963},
  doi = {10.3133/gp397},
  url = {https://pubs.usgs.gov/publication/gp397},
  note = {Source identifier: gp397}
}