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Källa:	Natural Processes in the Degradation of Open-Air Rock-Art Sites: An urgency intervention scale to inform conservation: The case of the Côa Valley world heritage site, Portugal [1-4073-1240-5; 1-4073-4208-8] Batarda Fernandes, António
	år:2014

Natural Processes in the Degradation of Open-Air Rock-Art Sites: An urgency intervention scale to inform conservation: The case of the Côa Valley world heritage site, Portugal [1-4073-1240-5; 1-4073-4208-8] Batarda Fernandes, António