@misc{indiciae2c0f90ba26bb,
  title = {A 125 year history of topographic mapping and GIS in the U.S. Geological Survey 1884-2009, part 2: 1980-2009},
  author = {E. Lynn Usery and Dalia Varanka and Michael P. Finn},
  year = {2009},
  url = {https://pubs.usgs.gov/publication/70004689},
  note = {Source identifier: 70004689}
}