@misc{indiciaebf54ba92e481,
  title = {First-approximation reduction of gravity data with the aid of a programmable pocket calculator},
  author = {Wilfred P. Hasbrouck},
  year = {1977},
  doi = {10.3133/ofr77600},
  url = {https://pubs.usgs.gov/publication/ofr77600},
  note = {Source identifier: ofr77600}
}