Major guide to over 22,000 nonprofit regional, national and international organizations. Gives brief descriptions, addresses, names of officers, etc. G33 2000s International Encyclopedia of the Social Sciences. Long survey articles on all phases of the social sciences. Includes contributors and bibliographies.
Emphasis is on principles, concepts, theories, methods, etc., rather than findings of research.
Political Parties and Civic Action Groups. Brief entries describe groups of various types working to affect public policy. Has an historical slant. Good indexes and glossary. The Almanac of American Politics.