<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31334012</termId><termName>eighteenmo</termName><termType>PT</termType><termNote><![CDATA[ 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.  ]]></termNote><termCreatedDate>2026-03-30 20:30:00</termCreatedDate><relation><relationType>UF</relationType><termId>31334013</termId><termName>18mo</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31334014</termId><termName>eighteen-mo</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31334015</termId><termName>octodecimo</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31311966</termId><termName>size for book formats</termName><termType>PT</termType></relation></term>  </Zthes>