The paper mills of the Bitlles river Historical milestone · Sant Pere de Riudebitlles, Alt Penedès, Barcelona Image of Sant Pere de Riudebitlles, not of the place itself. The regular flow of the Bitlles drove from the eighteenth century a concentration of paper mills that supplied deckle-edged and cigarette paper to the peninsular and colonial markets. The activity marked the appearance and the economy of the valley. siglo XVIII Photo: Jaume Meneses (CC BY-SA 2.0) What to see and do in Sant Pere de Riudebitlles