RT Journal Article SR Electronic T1 Abstracts JF Arboriculture & Urban Forestry (AUF) FD International Society of Arboriculture SP 80 OP 80 DO 10.48044/joa.1976.2.4.80 VO 2 IS 4 YR 1976 UL http://auf.isa-arbor.com/content/2/4/80.abstract