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Johnson, D. W., S.E. Lindberg, E.A. Bondietti, D.W. Cole, Gary M. Lovett, Myron J. Mitchell, L.H. Ragsdale, and L.F. Pitelka. 1987. “The Integrated Forest Study on Effects of Atmospheric Deposition: A Status Report”. Air Pollution Control Association Conference Proceedings, APCA, Pittsburgh, Pennsylvania.