The Laboratory of Tree-Ring Research

The Laboratory of Tree-Ring Research (LTRR) in Tucson, AZ is home to the world's largest collection of wood research specimens and their associated records, photographs, and analyses. This continuously expanding multi-taxon collection, built over the past century, provides invaluable biological and human information about life on earth.

Located at the University of Arizona, LTRR is a renowned institution that serves as a hub for dendrochronology research, offering a wealth of resources for scientists, students, and visitors interested in studying past landscapes, dendroarchaeology, and Aegean dendrochronology, among other areas. With its rich collection and commitment to outreach and education, LTRR plays a vital role in advancing our understanding of the natural world and human history.

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