RT Journal Article SR Electronic T1 Abstract JF Arboriculture & Urban Forestry (AUF) FD International Society of Arboriculture SP 69 OP 69 DO 10.48044/joa.1982.8.3.69 VO 8 IS 3 YR 1982 UL http://auf.isa-arbor.com/content/8/3/69.abstract