@misc{indiciaeccc7906eef69,
  title = {Time of travel and dispersion in a selected reach of Roberts Creek, Clayton County, Iowa},
  author = {D.W. Kolpin and S. J. Kalkhoff},
  year = {1992},
  doi = {10.3133/wri914145},
  url = {https://pubs.usgs.gov/publication/wri914145},
  note = {Source identifier: wri914145}
}