Title: Problemy zemnogo magnetizma
Subjects: Institut zemnogo magnetizma, ionosfery i rasprostranenii︠a︡ radiovoln (Akademii︠a︡ nauk SSSR), Geomagnetism, Research, Institut zemnogo magnetizma, ionosfery i rasprostranenii͡a radiovoln (Akademii͡a nauk SSSR)