Current state of underwater swimming in Russia

VlasyevThe current state of scuba diving in Russia: (Report read in the St. Petersburg military. Mor. Milk. The circle of the 16th Feb. 1909) / [Lieutenant Vlasyev.- St. Petersburg: B. and., 1909].-36 s .. -Aut.decree.At the end of the text.Described on the 1st s.text.Ex.: Without Titus.l.and region.;With a handle.litter.in the text..Electronic copy source: PB