Melnikov, N.
Safety in opencast mining - 1st ed. - Moscow Mir Publishers 1969 - 391 p. illus 23 cm.
Safety :Coal mining
622.8 / MEL/1969
Safety in opencast mining - 1st ed. - Moscow Mir Publishers 1969 - 391 p. illus 23 cm.
Safety :Coal mining
622.8 / MEL/1969