@misc{indiciae427b51f8ae2c,
  title = {Slope map of the North Little Rock quadrangle, Arkansas},
  author = {U.S. Geological Survey},
  year = {1978},
  doi = {10.3133/70210554},
  url = {https://pubs.usgs.gov/publication/70210554},
  note = {Source identifier: 70210554}
}