Sinclair, John
Coal-mining economics: organization and management by John Sinclair - London Pitman 1957 - 337p.
Coal miners --Great Britain
Coal mines and mining --Great Britain
Coal trade --Great Britain
Y2100x42 Si62
Coal-mining economics: organization and management by John Sinclair - London Pitman 1957 - 337p.
Coal miners --Great Britain
Coal mines and mining --Great Britain
Coal trade --Great Britain
Y2100x42 Si62
