PT - JOURNAL ARTICLE ED - , TI - Abstract AID - 10.48044/joa.1981.7.8.217 DP - 1981 Aug 01 TA - Arboriculture & Urban Forestry (AUF) PG - 217--217 VI - 7 IP - 8 4099 - http://auf.isa-arbor.com/content/7/8/217.short 4100 - http://auf.isa-arbor.com/content/7/8/217.full