TY - JOUR T1 - Do You Need to Buy that Piece of Equipment? JF - Arboriculture & Urban Forestry (AUF) JO - JOA SP - 179 LP - 180 DO - 10.48044/jauf.1978.042 VL - 4 IS - 8 AU - George P. Tyler Y1 - 1978/08/01 UR - http://auf.isa-arbor.com/content/4/8/179.abstract N2 - ER -