@misc{1156126,
  author = {Vaughn Agy},
  title = {An Atlas of oblique-incidence ionograms:},
  year = {1959},
  month = {1959-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.TN.31},
  language = {en},
}