RT Journal Article SR Electronic T1 Abstract JF Arboriculture & Urban Forestry (AUF) FD International Society of Arboriculture SP 100 OP 100 DO 10.48044/joa.1977.3.5.100 VO 3 IS 5 YR 1977 UL http://auf.isa-arbor.com/content/3/5/100.abstract AB