RT Journal Article SR Electronic T1 Abstract JF Arboriculture & Urban Forestry (AUF) JO JOA FD International Society of Arboriculture SP 47 OP 47 DO 10.48044/joa.1975.1.3.47 VO 1 IS 3 YR 1975 UL http://auf.isa-arbor.com/content/1/3/47.abstract AB