TY - JOUR T1 - Abstract JF - Arboriculture & Urban Forestry (AUF) SP - 32 LP - 32 DO - 10.48044/joa.1977.3.2.32 VL - 3 IS - 2 A2 - , Y1 - 1977/02/01 UR - http://auf.isa-arbor.com/content/3/2/32.abstract ER -