Arboriculture & Urban Forestry 41(6): November 2015 Wagner, J.F. 1970. Time study of tree trimming. pp 97–101. In: Pro- ceedings of the 46th International Shade Tree Conference. Walker, L.R., and M.R. Willig. 1999. An Introduction to Terrestrial Disturbances. pp. 1–16. In: L.R. Walker (Ed.). Ecosystems of Disturbed Ground (Ecosystems of the World 16). Elsevier, New York, New York, U.S. Watson, G. 1988. Organic mulch and grass competition influence tree root development. Journal of Arboriculture 14(8):200–203. Watson, G. 2002. Comparing formula methods of tree appraisal. Journal of Arboriculture 28(1):11–18. Wilson, C.L. 1976. Recent advances and setbacks in Dutch elm dis- ease research. Journal of Arboriculture 2(7):136–139. Yamamoto, S.T. 1985. Programmed tree pruning and public liability. Journal of Arboriculture 11(1):15–17. Yingling, E.L., C.A. Keeley, S. Little, and J. Burtis. 1979. Reducing damage to shade and woodland trees from construction activi- ties. Journal of Arboriculture 5(5):97–105. Zillmer, R.E., J.L. Boeder, and K.G. Genich. 2000. A productivity system for tree climbing training. Journal of Arboriculture 26(2):97–105. Jess Vogt, MPA, MSES, Ph.D. (corresponding author) Department of Environmental Science and Studies College of Science and Health DePaul University 1110 West Belden Avenue Chicago, Illinois 60614, U.S.
[email protected] Richard J. Hauer, Ph.D., C.F. College of Natural Resources University of Wisconsin Stevens Point 2100 Main Street Stevens Point, Wisconsin 54481, U.S. Burnell C. Fischer, Ph.D., C.F. School of Public and Environmental Affairs, and The Vincent and Elinor Ostrom Workshop in Political Theory and Policy Analysis Indiana University Bloomington 513 North Park Avenue Bloomington, Indiana 47408, U.S. 321 ©2015 International Society of Arboriculture
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