D.S. Nichols
Fox, D. G., A.M. Bartuska, J.G. Byrne, E. Cowling, R. Fisher, Gene E. Likens, S.E. Lindberg, R.A. Linthurst, J. Messer, and D.S. Nichols. 1989. “A Screening Procedure To Evaluate Air Pollution Effects On Class I Wilderness Areas”. Usda For. Serv. Gen. Tech. Rep. Rm-168., 36.