RT Journal Article SR Electronic T1 Wrestling with Diagnosis of Tree Problems JF Arboriculture & Urban Forestry (AUF) JO JOA FD International Society of Arboriculture SP 84 OP 84 DO 10.48044/jauf.1991.023 VO 17 IS 3 A1 Sandy Perry YR 1991 UL http://auf.isa-arbor.com/content/17/3/84.abstract AB