@misc{indiciaec8dc8012f96d,
  title = {Bathymetric contour maps for lakes surveyed in Iowa in 2003},
  author = {S. Mike Linhart and Kris D. Lund},
  year = {2006},
  doi = {10.3133/sim2933},
  url = {https://pubs.usgs.gov/publication/sim2933},
  note = {Source identifier: sim2933}
}