RT Journal Article SR Electronic T1 Abstract JF Arboriculture & Urban Forestry (AUF) JO JOA FD International Society of Arboriculture SP 55 OP 55 DO 10.48044/joa.1987.13.2.55 VO 13 IS 2 YR 1987 UL http://auf.isa-arbor.com/content/13/2/55.abstract AB