@misc{indiciae70c7792c10df,
  title = {Use of sketchmaster in compilation of geologic maps from air-photo enlargements},
  author = {I. G. Sohn},
  year = {1949},
  doi = {10.2113/gsecongeo.44.6.551},
  url = {https://pubs.usgs.gov/publication/70215458},
  note = {Source identifier: 70215458}
}