@misc{indiciae10f894ed2638,
  title = {Ground temperature measurements},
  author = {Daniel R. Norton and Irving Friedman and F. H. Olmsted},
  year = {1981},
  doi = {10.3133/pp1203},
  url = {https://pubs.usgs.gov/publication/pp1203},
  note = {Source identifier: pp1203}
}