@misc{indiciae73c99959bee6,
  title = {Surface materials map of the Herndon Quadrangle, Virginia},
  author = {Arthur E. Nelson},
  year = {1976},
  doi = {10.3133/ofr76712},
  url = {https://pubs.usgs.gov/publication/ofr76712},
  note = {Source identifier: ofr76712}
}