RT Journal Article SR Electronic T1 Pollutants in the Air and Acids in the Rain JF Arboriculture & Urban Forestry (AUF) JO JOA FD International Society of Arboriculture SP 70 OP 77 DO 10.48044/jauf.1987.012 VO 13 IS 3 A1 Ellis B. Cowling YR 1987 UL http://auf.isa-arbor.com/content/13/3/70.abstract AB