TY - JOUR T1 - Problems of Safety in Tree Work JF - Arboriculture & Urban Forestry (AUF) SP - 33 LP - 35 DO - 10.48044/jauf.1976.008 VL - 2 IS - 2 AU - Robert R. Herder Y1 - 1976/02/01 UR - http://auf.isa-arbor.com/content/2/2/33.abstract ER -