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Paleolithic period --- Petroglyphs --- Rock paintings --- Paléolithique --- Pétroglyphes --- Peintures rupestres --- Côa River Valley (Portugal) --- Côa, Vallée du (Portugal) --- Antiquities. --- Antiquités --- Arqueologia --- Vale do Côa --- Portugal. --- Paintings, Rock --- Pictured rocks --- Rock drawings --- Carvings, Rock --- Engravings, Rock --- Rock carvings --- Rock engravings --- Rock inscriptions --- Stone inscriptions --- Eolithic period --- Old Stone age --- Palaeolithic period --- Côa Valley (Portugal) --- Vale do Côa (Portugal) --- Archaeology --- Art, Prehistoric --- Painting, Prehistoric --- Picture-writing --- Inscriptions --- Stone age