@misc{indiciae8c6586000864,
  title = {Preliminary geologic map of the Annandale Quadrangle, Virginia},
  author = {A. C. Huffman and A.J. Froelich and Lucy M. Force},
  year = {1975},
  doi = {10.3133/ofr75254},
  url = {https://pubs.usgs.gov/publication/ofr75254},
  note = {Source identifier: ofr75254}
}