Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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One-eighteenth of a sheet. The eighteen-mo is an unusual method of imposition resulting in a section of 18 leaves, or 36 pages. One method of producing it is to fold a sheet concertina-wise, followed by an envelope fold, followed by a right angle fold. Although used in book production between about 1770 and 1840, it is seldom, if ever, used in bookwork today. It is, however, sometimes used in advertising work, etc., where the folded sheet is to be untrimmed and remain folded in compact form until unfolded for reading. Also written 18mo. Also called "octodecimo."

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