TY - JOUR T1 - Contributed Abstract JF - Arboriculture & Urban Forestry (AUF) SP - 182 LP - 182 DO - 10.48044/joa.1981.7.7.182 VL - 7 IS - 7 A2 - , Y1 - 1981/07/01 UR - http://auf.isa-arbor.com/content/7/7/182.abstract ER -