@misc{indiciaeaf7ee6af5c1e,
  title = {Map of the Louisville area, Kentucky, showing contours on the bedrock surface},
  author = {L. M. MacCary},
  year = {1955},
  doi = {10.3133/ha5},
  url = {https://pubs.usgs.gov/publication/ha5},
  note = {Source identifier: ha5}
}