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In page Cologne Cathedral:
"Repair and maintenance work is constantly being carried out in one or another section of the building, which is rarely completely free of scaffolding, as wind, rain, and pollution slowly eat away at the stones. The Dombauhütte, established to build the cathedral and keep it in repair, is said to employ the best stonemasons in the Rhineland. Half the costs of repair and maintenance are still borne by the Dombauverein.
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