PT - JOURNAL ARTICLE ED - , TI - Abstract AID - 10.48044/joa.1977.3.5.100 DP - 1977 May 01 TA - Arboriculture & Urban Forestry (AUF) PG - 100--100 VI - 3 IP - 5 4099 - http://auf.isa-arbor.com/content/3/5/100.short 4100 - http://auf.isa-arbor.com/content/3/5/100.full