Taking Tree-Ring Sample (image) University of Arizona Caption Ramzi Touchan of the University of Arizona's Laboratory of Tree-Ring Research takes a core from an Altas cedar, also known as Cedrus atlantica, in Morocco. Credit Photo courtesy of R. Touchan, University of Arizona. Usage Restrictions This photo may be used only to illustrate a story about the research described in the release, 20th Century One of Driest in Nine Centuries for Northwest Africa. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.