RT Journal Article SR Electronic T1 Abstract JF Arboriculture & Urban Forestry (AUF) JO JOA FD International Society of Arboriculture SP 220 OP 220 DO 10.48044/joa.1990.16.8.220 VO 16 IS 8 YR 1990 UL http://auf.isa-arbor.com/content/16/8/220.abstract AB