@misc{indiciaecc74e88faf44,
  title = {Wisconsin potential field grids, derivative maps, and tectonic interpretations},
  author = {David L. Daniels and S. L. Snyder and D.W. Geister and C. P. Ervin and M.G. Mudrey and W.F. Cannon and Connie Dicken},
  year = {2003},
  doi = {10.3133/ofr03147},
  url = {https://pubs.usgs.gov/publication/ofr03147},
  note = {Source identifier: ofr03147}
}