Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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quaternion

See textual note

A gathering consisting of four sheets folded once, and insetted. This was the form in which some manuscripts and early printed books, especially those of vellum, were assembled, with the first and eighth, second and seventh, etc., leaves being conjugate. See also:QUINTERNION ; SEXTERNION ; TERNION .

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