<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31343924</termId><termName>concrete blocks</termName><termType>PT</termType><termNote><![CDATA[ Large units of building material made from a mixture of cement and an aggregate, usually 8 x 16 inches and of various thicknesses.  A mixture of cement, aggregate, and water is vibrated and compacted in steel molds and then cured in air, steam, or under autoclaving processes. Became a very popular building material beginning in the early 20th century. ]]></termNote><termCreatedDate>2026-03-30 20:32:45</termCreatedDate><relation><relationType>UF</relationType><termId>31343925</termId><termName>block, concrete</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31343926</termId><termName>concrete block</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31343902</termId><termName>masonry units</termName><termType>PT</termType></relation><relation><relationType>BT</relationType><termId>31320011</termId><termName>construction block</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31320465</termId><termName>concrete</termName><termType>PT</termType></relation></term>  </Zthes>