@misc{indiciaeb0ba31495247,
  title = {Basic heat-flow data from the United States},
  author = {J.H. Sass and Robert J. Munroe},
  year = {1974},
  doi = {10.3133/ofr749},
  url = {https://pubs.usgs.gov/publication/ofr749},
  note = {Source identifier: ofr749}
}