Paperback. This publication contains 19 refereed presentations. The content is divided into four major sections, namely, geophysics, atmospheres, magnetospheric interactions and new mission plans for the Moon and Mercury. Papers cover such diverse topics as temperature variations across craters in the Polar Regions of the Moon and Mercury, Clementine Particle Measurements in Lunar Orbit, and The Mercury Orbiter Mission. The book provides the most recently updated reviews and discussions on the studies of these two terrestrial planetary objects and their intercomparison.