Rules for maintaining a journal of observations over the behavior of a magnetic compass when swimming in the seas of polar explo...

The rules for maintaining a journal of observations over the behavior of a magnetic compass when swimming in the seas of polar explosives / hydrogra.Ex.Glavsevmorputi at the Council of People's Commissars of the USSR.- Leningrad: ed.All -Union.Arctic.Institute, 1934. -[2], 8 s .. -.I. USSR.The Main Directorate of the Northern Sea Route.Hydrographic control. 1.Territory (collection).Electronic copy source: PBOriginal storage location: Ban RAS