Laboratory of Tree-Ring Research, the University of Arizona No description specified. 1-4 (4 Records) Documents Crop Yields, Tree-Rings, and Climate (1972) Tree Ring Dates from Arizona K: Puerco-Wide Ruin-Ganago Area (1966) Tree-Ring Dates from Arizona N - Q Verde - Show Low - St. Johns Area (1966) Tree-Ring Studies of Walpi Pueblo (1978)