550.3(06)
G37 3	Geophysical Observatory Reports of the Geodetic and Geophysical Research Institute of the Hungarian Academy of Sciences [Текст]. Observatory of Nagycenk. Report on: 1. Earth currents. 2. Geomagnetism. 3. Atmospheric electricity. 4. Ionosphere. — Sopron : Ed. by the Director, 1976. — 129 p.