This 3rd edition of the Directory updates and expands the information presented in the second edition. It also identifies additional groups participating in the coordination of environmental disease research. The purpose of this directory is to promote coordination and information exchange among these groups and the Agencies and institutions involved in identifying problems and initiating research in the area of environmentally related cancer and heart and lung disease. This directory summarizes the activities, accomplishments, and products of the numerous committees and working groups with concerns relevant to the activities of the Task Force on Environmental Cancer and Heart and Lung Disease.