PT - JOURNAL ARTICLE ED - International Society of Arboriculture TI - Abstract AID - 10.48044/joa.1977.3.2.32 DP - 1977 Feb 01 TA - Arboriculture & Urban Forestry (AUF) PG - 32--32 VI - 3 IP - 2 4099 - http://auf.isa-arbor.com/content/3/2/32.short 4100 - http://auf.isa-arbor.com/content/3/2/32.full