@misc{indiciaeafb4f68ffb9f,
  title = {Principal facts for gravity data collected in Wisconsin: A web site and CD-ROM for distribution of data},
  author = {Stephen L. Snyder and Daniel W. Geister and David L. Daniels and C. Patrick Ervin},
  year = {2004},
  doi = {10.3133/ofr03157},
  url = {https://pubs.usgs.gov/publication/ofr03157},
  note = {Source identifier: ofr03157}
}