The Laboratory of Tree-Ring Research (LTRR) at the University of Arizona currently houses approximately 2,000,000 wood research specimens and their associated records, photographs, analyses, etc. As the oldest dendrochronology laboratory in world, the LTRR’s collections are unparalleled in size and diversity. The continuously expanding multi-taxon collection contains records of life on earth that are an irreplaceable source of biological and human information, built over the past 100 years.

For more information, visit the Collection and Archives Page, or contact the Curator.