@misc{indiciae26a9dabca20e,
  title = {Bedrock map of the Annandale Quadrangle, Virginia},
  author = {A. C. Huffman and A.J. Froelich},
  year = {1975},
  doi = {10.3133/ofr75262},
  url = {https://pubs.usgs.gov/publication/ofr75262},
  note = {Source identifier: ofr75262}
}