Regulation on the receipt and transfer of telegraphic dispatch by electromagnetic telegraph

Regulation on the receipt and transfer of telegraphic dispatch by electromagnetic telegraph.- [St. Petersburg]: Type.Ch.Ex.ways.and public buildings, 1855. -93, [6] p., 23 l.cards., 45 l.table.: table .. -Ex.: Without region..1. The people (collection).Electronic copy source: PBPlace of storage of the original: the Central Museum of Communications named after A.S.Popova