@misc{indiciae76acc5831df8,
  title = {Map of Bedrock Geology of Yosemite Valley, 1913-1916},
  author = {Frank C. Calkins},
  year = {1970},
  doi = {10.3133/ofr7050},
  url = {https://pubs.usgs.gov/publication/ofr7050},
  note = {Source identifier: ofr7050}
}