@misc{1167111,
  author = {Wilhelm Nupen},
  title = {Checklist of references to literature on tropospheric propagation of UHF, VHF, and SHF radio waves (1929-1959) ::supplement #1 to NBS report 6001},
  year = {1959},
  month = {1959-07-01 04:07:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.RPT.6065},
  language = {en},
}