S.N. Khalturin and V.P. Obnorsky at work on the program of the Northern Union of Russian Workers. Coal. 1940
S.N. Khalturin and V.P. Obnorsky at work on the program of the Northern Union of Russian Workers. Coal. 1940
S.N. Khalturin and V.P. Obnorsky at work on the program of the Northern Union of Russian Workers. Coal. 1940