@misc{indiciae1a200275d44f,
  title = {Petrography and petrology of the Middlefield Granite},
  author = {Russell Gould Clark},
  year = {1968},
  doi = {10.3133/ofr6836},
  url = {https://pubs.usgs.gov/publication/ofr6836},
  note = {Source identifier: ofr6836}
}