Russell, P. B., J. M. Livingston, E. G. Dutton, R. Pueschel, J. A. Reagan, T. E. Defoor, M. A. Box, D. Allen, P. Pilewskie, B. M. Herman, S. A. Kinne, and D. J. Hofmann (1993), Pinatubo and Pre-Pinatubo Optical Depth Spectra: Mauna Loa Measurements, Comparisons, Inferred Particle Size Distributions, Radiative Effects, and Relationship to Lidar Data, J. Geophys. Res., 98, 22,969-22.