This catalog contains descriptions of the science education programs and materials in the National Diffusion Network (NDN). These programs and materials are available to school systems or other educational institutions for implementation in their classrooms. Some programs may be able to offer consultant services and limited assistance with the training and materials associated with installing one of these programs in schools. Information about the NDN is provided. Programs listed include: (1) "Conservation for Children"; (2) "Foundational Approaches in Science Teaching (FAST)"; (3) "Geology Is"; (4) "Hands-On Elementary Science"; (5) "Informal Science Study (ISS)"; (6) "Life Lab Science Program"; (7) "Marine Science Project: FOR SEA"; (8) "The Mechanical Universe"; (9) "Physics Resources and Instructional Strategies for Motivating Students (PRISMS)"; (10) "Physics-Teach to Learn Program"; (11) "Sci-Math"; (12) "Starwalk"; (13) "Stones and Bones: A Laboratory Approach to the Study of Biology, Modern Science, and Anthropology"; and (14) "Wildlife Inquiry through Zoo Education (WIZE)." A listing of state facilitators and a facilitator for private schools is also listed. (CW)