Industrial wiring : manual for trainee electricians / G.Polyakov and A.Kovarsky Montazh i ėkspluatat︠s︡ii︠a︡ promyshlennogo ėlektrooborudovanii︠a︡. Polyakov, G. Kovarsky, A. joint author. Electric machinery. Electric wiring. TK2189 .P613 621.3 POI Moscow : Progress Publishers, c1966. c1966. 1960 Text 307 p. : eng