Parrish, D.D., C.J. Hahn, E.J. Williams, R.B. Norton, F. Fehsenfeld, H.B. Singh, J.D. Shetter, B.W. Gandrud, and B. Ridley (1992), Indications of photochemical histories of Pacific air masses from measurements of atmospheric trace species at Pt. Arena, California, J. Geophys. Res., 97, 15,883-15.