Preface to 'Special Section: The NASA Stratosphere-Troposphere Exchange Project...

Pfister, L., P. B. Russell, E. F. Danielsen, and R. T. Watson (1991), Preface to 'Special Section: The NASA Stratosphere-Troposphere Exchange Project (STEP) Mid-Latitude Field Experiment.', J. Geophys. Res., 96, 17,400.