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Information carrying and ascertaining process - uses perforations forming pattern and light reflecting and absorbing surfaces with colour contrast for speed of recognition
British Museum Marbles-Greek Buildings represented by Fragments in the British Museum. By WR Lethaby. I. Diana's Temple at Ephesus. II. The Tomb of Mausolus. London: BT Batsford, 94 High Holborn, 1908. Two vols. 9½ ″× 6 ″. Pp. 1–36; 37–70 zs. net each.