@misc{indiciae413781e24728,
  title = {Systems for measuring thickness of temperate and polar ice from the ground or from the air.},
  author = {R.D. Watts and D.L. Wright},
  year = {2017},
  doi = {10.3189/s0022143000011485},
  url = {https://pubs.usgs.gov/publication/70011957},
  note = {Source identifier: 70011957}
}