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Supporting Arch, Dry Stone Vaults. Original caption: Set of 66 - - No. 19-B. Les Traraux Publics Les Mines - Et La Metallurgie Aux Temps - Des Romains -- Atlas by Alfred Leger -- Paris -- 1875 -- Plate III -- Voies Romaines. Fig. 11. Arceau de soutenement (Ech. ).
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