@misc{indiciae7c58fb603bca,
  title = {Bathymetric contour maps for lakes surveyed in Iowa in 2006},
  author = {S. M. Linhart and K. D. Lund},
  year = {2008},
  doi = {10.3133/sim3051},
  url = {https://pubs.usgs.gov/publication/sim3051},
  note = {Source identifier: sim3051}
}