Magnetic observations made in 1881 and new magnetic maps of the Caspian Sea

Rykachev, M.Magnetic observations made in 1881 and new magnetic maps of the Caspian Sea / [Op.] M. Rykachev.- St. Petersburg: Type.Mr. Mr., 1885. -[2], 61, 69 p., 7 l.table., pl., cards.: table .. -On the region.Koll.: New magnetic cards of the Caspian Sea.Bibliogr.In the settling.Note .. - (from the "Sea Collection" 1883. No. 10 and 1885. No. 1)..1. Territory (collection).Electronic copy source: PBOriginal storage: RSGMU