Welcome to the LTRR Collection

The LTRR is home to the world's largest and most diverse collection of tree-ring specimens.  Housed in the dedicated Tree-Ring Archive Building adjoining the Bryant Bannister Tree-Ring Building, the repository has two environmentally controlled floors containing 4.4km of shelving as well as a separate curation work area.  The repository is the only federally recognized facility for the storage of tree-ring specimens, and contains many samples from federally protected lands. 

Prior to moving in to our current facilities in 2012, the LTRR specimens were housed in various 'temporary' facilities - primarily under the UA Stadium.  The task of cataloging and moving specimens collected over the past 80 years is well under way but a great deal of work is still to be done.  Funding from the Department of the Interior, National Park Service, National Science Foundation, Institute of Museum and Library Services, National Endowment for the Humanities is continuing to support this enormous task.