@article {748, title = {Analysis of Tree Rings and Climatic Changes}, year = {1978}, keywords = {changes, climate, dendrochronology, environment, tree rings}, author = {unknown} } @article {749, title = {Climatic Information from Analysis of Cellulose Lignin and Whole Wood from Tree Rings}, volume = {270}, year = {1977}, note = {Copies of this are available from the Tree Ring Laboratory. Please contact the curator for more information. pcreasman@ltrr.arizona.edu}, keywords = {analysis, cellulose, climate, dendrochronology, lignin, tree ring, tree rings}, author = {unknown} } @article {793, title = {Address at High School on Halleys Comet}, year = {1910}, note = {This title is available through the Tree Ring Laboratory; please contact the lab for more information. }, address = {Tucson}, keywords = {address, comet, Douglass, Halleys, high school, historic}, author = {unknown} }