This is the second issue of JGE-Planets containing a special section of papers that were stimulated by the Martial Surface Atmosphere Through Time (MSATT) workshop held in Boulder, Colorado, September 23--25, 1991. The first collection of papers was published in the February issue of JGR-Planets. MSATT is the last in a series of 3-year Mars data analysis programs that have focused on specific scientific themes. The program was inaugurated at the Boulder workshops, and the 15 papers contained in this special section raise to 38 the total number of papers it produced.