RT Journal Article SR Electronic T1 Abstracts JF Arboriculture & Urban Forestry (AUF) JO JOA FD International Society of Arboriculture SP 161 OP 161 DO 10.48044/joa.1978.4.7.161 VO 4 IS 7 YR 1978 UL http://auf.isa-arbor.com/content/4/7/161.abstract AB