The triangulation of the Baltic Sea.Part 1. From Pulkov to Plangen and from Pulkov to Friedrichsgamon

The triangulation of the Baltic Sea.- Petrograd: [B.I.], 1915. -.1. Territory (collection).Electronic copy source: PBOriginal storage: RSGMUPart 1: From Pulkov to Plangen and from Pulkov to Friedrichsgamon.- ed.Ch.Hydrogr.Exp., 1915. -[4], II, 270 p., 19 l.Damn., cards.: Table., Il .. -Bibliogr.in the text and subscription.Note..1. Territory (collection).Electronic copy source: PBOriginal storage: RSGMU