RT Journal Article SR Electronic T1 Abstract JF Arboriculture & Urban Forestry (AUF) JO JOA FD International Society of Arboriculture SP 209 OP 209 DO 10.48044/joa.1979.5.9.209 VO 5 IS 9 YR 1979 UL http://auf.isa-arbor.com/content/5/9/209.abstract AB