RT Journal Article SR Electronic T1 Professional Consultation to Help Avoid Legal Problems of Shade Commissions JF Arboriculture & Urban Forestry (AUF) FD International Society of Arboriculture SP 106 OP 109 DO 10.48044/jauf.1981.024 VO 7 IS 4 A1 William J. Porter YR 1981 UL http://auf.isa-arbor.com/content/7/4/106.abstract AB