Dendrochronology

Breternitz, D.A., 1967, The eruption(s) of Sunset Crater-dating and effects: Plateau, v. 40, no. 2, p. 72-76.

Bannister, B., and Robinson, W.J., 1971, Tree ring dates from Arizona U-W, Gila-Salt rivers area: Tucson, University of Arizona, Laboratory of Tree-Ring Research, 47 p.