This survey includes some 350 United States organizations in the fields of ecology, conservation, and environmental sciences. It is intended to provide the public with valuable information, and to offer scientists, administrators, and citizens, communication channels which will bring to light some instances of overlap and duplication, and encourage cooperation. The organizations listed are classified according to their structures and goals into six major categories: 1) college and university centers; 2) non-profit organizations and associations; 3) citizens' groups; 4) federal government departments and agencies; 5) professional societies and academies; and, 6) other organizations, which include publishers and journals, as well as science-based industries. Each listing offers the name of the organization, its address, telephone number, the name of a responsible person, and a brief description of its functions and activities. This survey will be published on an annual basis in order to insure that the entries are up-dated and accurate. (Author/JLB)