@misc{indiciaeca66ad7a0c61,
  title = {Graphs of ground-water levels in Minnesota, 1957-1961},
  author = {G.C. Straka and W. A. Miller},
  year = {1963},
  url = {https://pubs.usgs.gov/publication/70175775},
  note = {Source identifier: 70175775}
}