Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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A GATHERING (2) composed of six sheets, each folded once and insetted. This was the form in which some bound manuscripts and early printed books, especially those of vellum, were assembled. The first and twelfth, second and eleventh, etc., leaves being conjugate. See also:QUATERNION ; QUINTERNION ; TERNION . (140 )

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