The Great Lakes Science Advisory Board of the International Joint Commission surveyed several hundred educators and producers of educational programs. One of the results of the survey was the development of this directory, which is limited to materials and producers of materials dealing with the Great Lakes Basin ecosystem, environmental studies, and ecology in general. Each resource entry is included in a category according to its format. Over 250 resources are grouped into the following categories: (1) audio-visual materials; (2) books; (3) booklets; (4) instructional materials; (5) newsletters; (6) pamphlets; (7) periodicals, serials, journals; (8) special reports; and (9) sources. Most entries include titles, publishers and producers, addresses, publication dates, cost, topic of coverage, emphasis, and audience levels. Also included is an alphabetical/subject index designed to help the user locate particular materials. (CW)