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  9. [size for book formats]
  10. eighteenmo
Scope note
Uncommon book format with 18 leaves and 36 pages, used in bookmaking from 1770-1840, but rarely used today. The most common method of creating the size is to fold a sheet in an accordian-fold, followed by an envelope fold, and a right angle fold.
Accepted term: 17-Jun-2024