RT Journal Article SR Electronic T1 An Effective Tree Trimming Program JF Arboriculture & Urban Forestry (AUF) JO JOA FD International Society of Arboriculture SP 24 OP 25 DO 10.48044/jauf.1980.007 VO 6 IS 1 A1 Leslie A. Bell YR 1980 UL http://auf.isa-arbor.com/content/6/1/24.abstract