Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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A book size produced by folding a sheet with six right angle folds, giving a leaf size 1/64 the size of the sheet and forming a section of 128 pages. As it is both difficult and impractical to fold a sheet with six right angle folds, the 64mo is generally composed of a sheet folded with both parallel and right angle folds, or by using more than one sheet of paper and insetting. Written as 64mo or 64°.

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