<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31436618</termId><termName>hydrogeology</termName><termType>PT</termType><termNote><![CDATA[ The branch of geology which studies water on or below the surface of the earth in relation to its geologic environment. ]]></termNote><termCreatedDate>2026-03-30 20:57:43</termCreatedDate><relation><relationType>UF</relationType><termId>31436619</termId><termName>geohydrology</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31410605</termId><termName>geology</termName><termType>PT</termType></relation><relation><relationType>BT</relationType><termId>31410618</termId><termName>hydrology</termName><termType>PT</termType></relation></term>  </Zthes>