@misc{indiciaefb97e148edcd,
  title = {Gravity observations by U.S. Geological Survey in Kentucky prior to October 1, 1961},
  author = {Joel S. Watkins},
  year = {1962},
  doi = {10.3133/ofr62149},
  url = {https://pubs.usgs.gov/publication/ofr62149},
  note = {Source identifier: ofr62149}
}