Description of sea warning signs at the Finnish and Riga bays, Baltic Sea and Moison and in the outskirts of Schcher at the nort...

Description of sea warning signs at the Finnish and Riga bays, the Baltic Sea and Moison and in the outskirts of Schcher at the northern shores of the Gulf of Finland and the Baltic Sea.- Petrograd: ed.GLHydrogr.Ex., 1918. -XXIII, 199 s .. -For military vessels..1. Territory (Collection).Electronic Source: PBOriginal Storage Place: Gunio Mo RF