5 links
Dendrochronology
sonic.net
A brief primer on the subject of dating past events by looking at tree rings.
International Tree Ring Laboratory
gwdg.de
Dr. habil Martin Worbes' tree-ring research in temperate, tropical, and subtropical regions.
Laboratory of Tree-Ring Research, University of Arizona
ltrr.arizona.edu
Teaching and research in all aspects of dendrochronology.
Rocky Mountain Tree-Ring Research, Inc.
rmtrr.org
Rocky Mountain Tree-Ring Research is a nonprofit research organization that provides expertise in tree-ring data collection and analysis.
University of Arkansas Tree-Ring Laboratory
uark.edu
Research concentrates on the development of exactly-dated annual tree-ring chronologies from ancient forests worldwide.