Field research in the Balkan region (IMAGE) University of Arizona Caption Wood samples from the Balkan region were among those analyzed for this study. Credit Courtesy of Valerie Trouet Usage Restrictions This visual may only be used in the context of reporting on the research referenced in this news release. Credit must be provided as indicated. License Original content 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.