RT Journal Article SR Electronic T1 Abstract JF Arboriculture & Urban Forestry (AUF) JO JOA FD International Society of Arboriculture SP 237 OP 237 DO 10.48044/joa.1975.1.12.237 VO 1 IS 12 YR 1975 UL http://auf.isa-arbor.com/content/1/12/237.abstract AB