RT Journal Article SR Electronic T1 Urban Forestry Productivity JF Arboriculture & Urban Forestry (AUF) JO JOA FD International Society of Arboriculture SP 279 OP 280 DO 10.48044/jauf.1980.067 VO 6 IS 10 A1 Philip A. Pierce YR 1980 UL http://auf.isa-arbor.com/content/6/10/279.abstract AB