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- United States237
- United States. Congress. Senate. Committee on Foreign Relations, author126
- United States. Congress. House. Committee on Foreign Affairs, author92
- United States. Congress. House. Committee on Foreign Affairs. Subcommittee on the Middle East and North Africa, author54
- United States. Congress. House. Committee on Foreign Affairs. Subcommittee on Asia and the Pacific, author44
- United States. Congress. House. Committee on Foreign Affairs. Subcommittee on Africa, Global Health, Global Human Rights, and International Organizations, author37
- Institute for Security Studies (Paris, France)35
- United States. Department of State32
- United States. Congress. Commission on Security and Cooperation in Europe, author28
- Council on Foreign Relations22
- United States. Congress. House. Committee on Foreign Affairs. Subcommittee on Terrorism, Nonproliferation, and Trade, author22
- United States. Congressional-Executive Commission on China, author22
- Walter L. Pforzheimer Intelligence Collection (Beinecke Rare Book and Manuscript Library)22
- Mexico. Secretaría de Relaciones Exteriores19
- United States. Congress. House. Committee on Armed Services, author18
- United States. Congress. House. Committee on Foreign Affairs. Subcommittee on Europe, Eurasia, and Emerging Threats, author16
- United States. Department of State. Office of the Historian15
- Heritage Foundation (Washington, D.C.)14
- Peru. Ministerio de Relaciones Exteriores14
- United States. Congress. House. Committee on Foreign Affairs. Subcommittee on the Western Hemisphere, author14