PT - JOURNAL ARTICLE ED - International Society of Arboriculture TI - Abstract AID - 10.48044/joa.1977.3.5.97 DP - 1977 May 01 TA - Arboriculture & Urban Forestry (AUF) PG - 97--97 VI - 3 IP - 5 4099 - http://auf.isa-arbor.com/content/3/5/97.short 4100 - http://auf.isa-arbor.com/content/3/5/97.full