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Clark, Susanmarie. 1987. ?Potential For Use Of Cottonwoods In Dendrogeomorphology And Paleohydrology?. Department Of Geosciences. Department Of Geosciences. Tucson: University of Arizona.

Cook, Edward Roger. 1985. ?The Use And Limitation Of Dendrochronology In Studying The Effects Of Air Pollution On Forests?. Proceedings Of Nato Advanced Research Workshop: Effects Of Acidic Deposition On Forests, Wetlands And Agricultural Ecosystems. Proceedings Of Nato Advanced Research Workshop: Effects Of Acidic Deposition On Forests, Wetlands And Agricultural Ecosystems.