@misc{indiciae8a99978abbd7,
  title = {Famous building stones of our Nation's capital},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {2012},
  doi = {10.3133/fs20123044},
  url = {https://pubs.usgs.gov/publication/fs20123044},
  note = {Source identifier: fs20123044}
}