This digest identifies selected sources of materials for environmental education. Included are: the Educational Resources Information Center; the United States Environmental Protection Agency; the Public Broadcasting System; the National Wildlife Federation; and the National Science Teachers Association. References and reviews of print, audiovisual, and computer software materials; Eco-NET; sources of technical information on the environment; local and state sources; and professional associations are discussed. Ten sources of environmental education information and six references are listed. (CW)