@misc{indiciaec159dc39711f,
  title = {Aeromagnetic survey of the Oelwein and part of the Dubuque North 1:100,000 quadrangles, Wisconsin and Iowa},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1999},
  doi = {10.3133/ofr99526h},
  url = {https://pubs.usgs.gov/publication/ofr99526H},
  note = {Source identifier: ofr99526H}
}