The drawings of laying a telephone cable on the 1935 Hovhanmaa-Tienhaara line.Blue.Scale 1: 100, 1: 1000

The drawings of laying a telephone cable on the 1935 Hovhanmaa-Tienhaara line.Blue.Scale 1: 100, 1: 1000.- 1935. -Foundation 531 "A collection of maps, plans and drawings of Vyborg, Vyborg, Mikkel and Coopiosa provinces" , inventory 1, case 449..Electronic copy source: PB