@misc{indiciae1e9bb5e82511,
  title = {Principal facts for gravity stations in the North Park-Middle Park area, Colorado},
  author = {John Charles Behrendt and Peter Popenoe},
  year = {1970},
  doi = {10.3133/ofr7022},
  url = {https://pubs.usgs.gov/publication/ofr7022},
  note = {Source identifier: ofr7022}
}