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railway, which transported said coal to the seaports of Santander and Bilbao, as well as to the Altos Hornos de Vizcaya in the Basque Country. With the onset of mining in the area at the start of the 20th century and the influx of people from other regions seeking employment in coal extraction, the character of the town underwent a radical change as the old urban centre was surrounded by new housing. The town's population would increasingly increase until it reached a high point in the 1960s, when

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