Watson, J. G., Blumenthal, D., Chow, J. C., Cahill, C., Cal, M., Divita, F., Freeman, D., Gillies, J. A., Richards, L., Chinkin, L., Lindsey, C., Prouty, J., Dietrich, D., Cobb, D., Houck, J., Dickson, R., Andersen, S. (1995). Mt. Zirkel Wilderness Area reasonable attribution study of visibility impairment – Volume I: Study plan