<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31386352</termId><termName>backed blades</termName><termType>PT</termType><termNote><![CDATA[ Terminology used by prehistorians for a class of microlithic blades with one edge blunted by a secondary retouch. It is assumed that this was so that they could be held more easily. Backed blades first appeared in the early Upper Paleolithic. ]]></termNote><termCreatedDate>2026-03-30 20:44:12</termCreatedDate><relation><relationType>UF</relationType><termId>31386353</termId><termName>backed blade</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31386354</termId><termName>blades, backed</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31353015</termId><termName>cutting tools</termName><termType>PT</termType></relation></term>  </Zthes>