<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31372077</termId><termName>fluorine dating</termName><termType>PT</termType><termNote><![CDATA[ Method of relative dating by measuring the amount of fluorine absorbed by groundwater percolation into the crystal lattice of the mineral component of buried bone. ]]></termNote><termCreatedDate>2026-03-30 20:40:21</termCreatedDate><relation><relationType>UF</relationType><termId>31372078</termId><termName>dating, fluorine</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31341199</termId><termName>bone dating techniques</termName><termType>PT</termType></relation></term>  </Zthes>