The world coal-mining industry.

The world coal-mining industry.

Библиографические подробности
Соавтор: International Labor Office
Формат: ‌
Язык:English
Опубликовано: Nendeln Kraus Reprint 1975.
Серии:Studies and reports. Series B (Economic conditions) nos. 31-32
Предметы:
Coal mines and mining.
Coal trade.
Coal-miners.