@misc{indiciae96a73a3d5972,
  title = {Aeromagnetic map of the Portland-Vancouver Metropolitan area, Oregon and Washington},
  author = {Stephen L. Snyder and T.J. Felger and R.J. Blakely and R.E. Wells},
  year = {1993},
  doi = {10.3133/ofr93211},
  url = {https://pubs.usgs.gov/publication/ofr93211},
  note = {Source identifier: ofr93211}
}