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Author/Creator
- United States. Congress. House119
- United States87
- ebrary, Inc39
- United States. Department of State33
- Library of Congress. Congressional Research Service25
- United States. Congress. Senate. Committee on Foreign Relations. (1816- )22
- United States. Department of State. Advisory Commission on Educational Exchanges21
- Pan American Union20
- Adam Matthew Digital (Firm), digitiser19
- Project Muse19
- United States. Congress. Senate19
- United States. Congress. House. Committee on Foreign Affairs. (1822-1975, 1979- )15
- United States. Advisory Commission on International Educational and Cultural Affairs13
- Rowe, L.S., (Leo Stanton)11
- Smithsonian Institution10
- United States. Congress. House. Committee on Foreign Affairs10
- ProQuest (Firm)9
- United States. Department of State. Advisory Commission on Information9
- Bulgaria8
- United States. Congress. Senate. Committee on Foreign Relations7