As zeolite science continues to grow, many zeolite conferences and meeting are being held around the world, but the premier venue to present new work continues to be the International Zeolite Conferences. The 12th International Zeolite Conference was held in Baltimore, Maryland, in July 1998, and included 774 participants from 37 different countries. It also spawned this comprehensive four-volume, 3360-page proceedings that covers many diverse areas of zeolite study only touched upon at previous conferences. Topics include: diffusion; adsorption; theory and modeling; structure; industrial applications; synthesis; catalysis; membranes; mesoporous materials; solid-state applications and characterization.