<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Gray, John</style></author><author><style face="normal" font="default" size="100%">Thompson, Peter</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Climatic Information from Ratios of Cellulose in Tree Rings</style></title><secondary-title><style face="normal" font="default" size="100%">Nature</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">18 isotope</style></keyword><keyword><style  face="normal" font="default" size="100%">cellulose</style></keyword><keyword><style  face="normal" font="default" size="100%">climate</style></keyword><keyword><style  face="normal" font="default" size="100%">environment</style></keyword><keyword><style  face="normal" font="default" size="100%">O</style></keyword><keyword><style  face="normal" font="default" size="100%">oxygen</style></keyword><keyword><style  face="normal" font="default" size="100%">paleoclimatology</style></keyword><keyword><style  face="normal" font="default" size="100%">ratios</style></keyword><keyword><style  face="normal" font="default" size="100%">tree rings</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1976</style></year></dates><volume><style face="normal" font="default" size="100%">262</style></volume><issue><style face="normal" font="default" size="100%">No. 5568</style></issue></record></records></xml>