Many believe that children begin to learn science from the moment they start to perceive their environment. They have an innate need to make sense of what happens. Little by little, they form a useful model of the world around them. Before children go to school, they exercise their natural curiosity daily. School can expand a child's understanding of the universe or it can close off the search for knowledge by presenting science as a set of words from a textbook. This guide is designed to assist those who are working to improve elementary science education. The materials described are recommended because they provide support for effective hands-on, inquiry based programs. Included in this guide are descriptions of curriculum materials, supplementary resources including various kinds of books, magazines, and other reference materials, and sources of information and assistance such as museums, and technology centers, professional organizations, publishers, elementary science curriculum projects, and science materials suppliers. Each resource listed includes an address and a description of the program, project, center, museum or organization involved. (CW)