@misc{indiciaee2a3df9b3fe9,
  title = {Computer program for the Hewlett-Packard-9825A to contour and plot data collected from helium surveys},
  author = {G. Michael Reimer and V.C. Dean},
  year = {1979},
  doi = {10.3133/ofr79865},
  url = {https://pubs.usgs.gov/publication/ofr79865},
  note = {Source identifier: ofr79865}
}