Oxford Tree-Ring Laboratory - An independent tree-ring dating laboratory concentrating primarily on the dating and analysis of standing timber structures. Projects, publications, the dated buildings register and interactive maps. Laboratory of Tree-Ring Research, University of Arizona - Teaching and research in all aspects of dendrochronology. Rocky Mountain Tree-Ring Research, Inc. - Rocky Mountain Tree-Ring Research is a nonprofit research organization that provides expertise in tree-ring data collection and analysis. The Ultimate Tree-Ring Web Pages - Organized collection of information and links on tree-ring research, or dendrochronology, by Henri D. Grissino-Mayer. Euro Catalogue - Searchable database of European dendro-chronology, compiled by Dr Tom Levanic, Biotechnical faculty, Ljubljana, Slovenia. Information on laboratories, accessed via search or sensitive map. Dendrochronology - A brief primer on the subject of dating past events by looking at tree rings. International Tree Ring Laboratory - Dr. habil Martin Worbes' tree-ring research in temperate, tropical, and subtropical regions. University of Arkansas Tree-Ring Laboratory - Research concentrates on the development of exactly-dated annual tree-ring chronologies from ancient forests worldwide. Sheffield Dendrochronology Laboratory - Teaching and research at the University of Sheffield. Includes "What is Dendrochronology?" and information about the lab's consultancy services and continuous master tree-ring sequence for England going back to about 5000 BC. Flickr: Tree Rings and Dendrochronology - Provides photos of tree rings and forums for discussion of the study of dendrochronology.