TY - JOUR T1 - Pruning — Why, When and How JF - Arboriculture & Urban Forestry (AUF) JO - JOA SP - 239 LP - 240 DO - 10.48044/jauf.1979.056 VL - 5 IS - 10 AU - David L. Hensley Y1 - 1979/10/01 UR - http://auf.isa-arbor.com/content/5/10/239.abstract ER -