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The Size Nomenclature of Books:
  • 4to – A book that is up to 12″ tall. See Quarto.
  • 8vo – A book that is up to 9 ¾” tall. See Octavo.
  • 12mo – A book that is up to 7 ¾” tall. See Duodecimo.
  • 16mo – A book that is up to 6 ¾” tall. See Sextodecimo.
  • 24mo – A book that is up to 5 ¾” tall.
  • 32mo – A book that is up to 5″ tall.
  • 48mo – A book that is up to 4″ tall.
  • 64mo – A book that is up to 3″ tall.
  • Folio – A book that is up to 15″ tall.
  • Elephant Folio – A book that is up to 23″ tall.
  • Atlas Folio – A book that is up to 25″ tall.
  • Double Elephant Folio – A book that is up to 50″ tall.