@misc{indiciae69f5072ea7f4,
  title = {State coordinates and polyconic maps some notes on the state plane-coordinates systems and their relation to polyconic quadrangle maps},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1949},
  doi = {10.3133/cir57},
  url = {https://pubs.usgs.gov/publication/cir57},
  note = {Source identifier: cir57}
}