RT Journal Article SR Electronic T1 Marketing Tree Maintenance Contracts JF Arboriculture & Urban Forestry (AUF) JO JOA FD International Society of Arboriculture SP 48 OP 49 DO 10.48044/jauf.1986.010 VO 12 IS 2 A1 Ted Collins YR 1986 UL http://auf.isa-arbor.com/content/12/2/48.abstract AB