TY - JOUR T1 - Abstract JF - Arboriculture & Urban Forestry (AUF) JO - JOA SP - 199 LP - 199 DO - 10.48044/joa.1991.17.7.199 VL - 17 IS - 7 A2 - , Y1 - 1991/07/01 UR - http://auf.isa-arbor.com/content/17/7/199.abstract N2 - ER -