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reading and marking corrections on a proof or other copy of the text of articles and books before publication. Proofreading dates from the early days of printing. A contract of 1499 held the author finally responsible for correction of proofs. In modern practice, proofs are made first from a galley, a long tray holding a column of type, and hence are called galley proofs; the term is sometimes also used for the first copy produced in photocomposition and other forms of typesetting that do not involve metal type.