@misc{indiciae41c16825791d,
  title = {Topographic instructions, Book 1, Part 1-A, Preface and contents},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1950},
  doi = {10.3133/cir92},
  url = {https://pubs.usgs.gov/publication/cir92},
  note = {Source identifier: cir92}
}