@misc{indiciaeece4077a811d,
  title = {The gabbros and associated hornblende rocks occurring in the neighborhood of Baltimore, Maryland},
  author = {George Huntington Williams},
  year = {1886},
  doi = {10.3133/b28},
  url = {https://pubs.usgs.gov/publication/b28},
  note = {Source identifier: b28}
}