@misc{indiciae347f35030a5c,
  title = {Topographic instructions of the United States Geological Survey},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1918},
  doi = {10.3133/70039569},
  url = {https://pubs.usgs.gov/publication/70039569},
  note = {Source identifier: 70039569}
}