PT - JOURNAL ARTICLE ED - , TI - Abstract AID - 10.48044/joa.1982.8.9.252 DP - 1982 Sep 01 TA - Arboriculture & Urban Forestry (AUF) PG - 252--252 VI - 8 IP - 9 4099 - http://auf.isa-arbor.com/content/8/9/252.short 4100 - http://auf.isa-arbor.com/content/8/9/252.full