@misc{indiciae45a6a44961a3,
  title = {The helicopter and the walkie-talkie in field surveys},
  author = {J.B. Rowland},
  year = {1954},
  doi = {10.1126/science.119.3090.389.a},
  url = {https://pubs.usgs.gov/publication/70010843},
  note = {Source identifier: 70010843}
}