Mining - Fossil
Mining
Coal - Order card - Mining
Coal mine - State mine - Cooling towers - Heerlen
Coal - Miners - Ovoids - Eygelshoven
Coal mine - Oranje Nassau Mines - Heerlen
Coal mine - State mine - Cooling towers - Treebeek
Coal stove
Salt tower - Hengelo
Coal stove - Coal kit - Order list
Mining - Coal
Wacnuts - Stone coal
S.H.V. - Coal Trade Association - Utrecht
Table salt - Royal Dutch Salt Industry - Boekelo
Coal mine - State mine - Cooling towers - Geleen
Natural stone
Stone coal - Miners lamp - Groningen
