TY - JOUR T1 - Contributed Abstract JF - Arboriculture & Urban Forestry (AUF) SP - 207 LP - 207 DO - 10.48044/joa.1981.7.8.207 VL - 7 IS - 8 A2 - , Y1 - 1981/08/01 UR - http://auf.isa-arbor.com/content/7/8/207.abstract N2 - ER -