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CLAYS --- LIMONITE --- CARBONATE ROCKS --- PHOSPHATE DEPOSITS --- SILICATE MINERALS --- BELGIQUE --- ATLASES --- PITS EXCAVATIONS --- STATISTICAL DATA --- QUARRYING --- SANDS --- ROCKS --- COAL, BROWN --- INDUSTRIE --- CLAYS --- LIMONITE --- CARBONATE ROCKS --- PHOSPHATE DEPOSITS --- SILICATE MINERALS --- BELGIQUE --- ATLASES --- PITS EXCAVATIONS --- STATISTICAL DATA --- QUARRYING --- SANDS --- ROCKS --- COAL, BROWN --- INDUSTRIE --- 20E SIECLE