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- Economist Intelligence Unit (Great Britain)483
- United States69
- Harmon, Robert B. (Robert Bartlett), 1932-47
- United States. Congress. Senate. Committee on Foreign Relations, author28
- United States. Congress. Commission on Security and Cooperation in Europe, author26
- Walter L. Pforzheimer Intelligence Collection (Beinecke Rare Book and Manuscript Library)23
- Heritage Foundation (Washington, D.C.)22
- United States. Congress. House. Committee on Foreign Affairs. Subcommittee on Africa, Global Health, Global Human Rights, and International Organizations, author19
- Congressional Quarterly, inc17
- United States. Congress. House. Committee on Foreign Affairs. Subcommittee on the Middle East and North Africa, author17
- Institute for Security Studies (Paris, France)16
- United States. Congress. House. Committee on Foreign Affairs, author16
- World Bank16
- Rose, Richard, 1933-15
- Brookings Institution14
- Institute for the Comparative Study of Political Systems (U.S.)14
- Inter-university Consortium for Political and Social Research14
- United States. Congress. Commission on Security and Cooperation in Europe14
- United States. Congress. House. Committee on Foreign Affairs. Subcommittee on Asia and the Pacific, author14
- Royal Institute of International Affairs13