RT Journal Article SR Electronic T1 Contributed Abstract JF Arboriculture & Urban Forestry (AUF) FD International Society of Arboriculture SP 305 OP 305 DO 10.48044/joa.1991.17.11.305 VO 17 IS 11 YR 1991 UL http://auf.isa-arbor.com/content/17/11/305.abstract AB