This resource booklet lists 139 organizations which the American Medical Student Association's Occupational and Environmental Health Task Force surveyed in 1979 as potential sources of extracurricular learning opportunities for health science students, especially medical students. Information provided for those organizations that responded may include any or all of the following: (1) name, address (and addresses of other offices/laboratories, if applicable), and or telephone numbers; (2) contact person; and (3) description of organization, its purpose, activities, programs, services, opportunities or placement for students, publications and/or materials, and address(es), and/or phone numbers for additional information. (Names and addresses of nonresponders to the questionnaire are also listed so that their addresses are available to interested students.) A geographical index lists the organizations alphabetically by state or province (Canada), also in alphabetical order. (YLB)