PT - JOURNAL ARTICLE ED - , TI - Abstract AID - 10.48044/joa.1991.17.8.216 DP - 1991 Aug 01 TA - Arboriculture & Urban Forestry (AUF) PG - 216--216 VI - 17 IP - 8 4099 - http://auf.isa-arbor.com/content/17/8/216.short 4100 - http://auf.isa-arbor.com/content/17/8/216.full