Cette photo déjà sur Wikimédia File:Inside the Celtic Iron Age hillfort of Tre'r Ceiri, Gwynedd Wales, with 150 houses; finest in N Europe 42.jpg a été recadrée, éclaircie et nettoyée par moi, avant sa proposition de mise sur Wikimédia, pour l'adapter et illustrer mon article en cours de préparation sur le brouillon de Wikipédia.
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