Economics of coal washing in India
Ghosh, A B
Economics of coal washing in India - Calcutta: New Age Publishing Private Ltd., 1966 - 144p.
Coal mines and mining
Mining engineering
622.333:622.763:33 / K6
Economics of coal washing in India - Calcutta: New Age Publishing Private Ltd., 1966 - 144p.
Coal mines and mining
Mining engineering
622.333:622.763:33 / K6