Averages of critical frequencies and virtual heights of the ionosphere, observed by the National Bureau of Standards, Washington, D.C., 1934–1936
- 1 January 1936
- journal article
- Published by American Geophysical Union (AGU) in Journal of Geophysical Research
- Vol. 41 (4), 379-388
- https://doi.org/10.1029/te041i004p00379