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- United States. Congress. Commission on Security and Cooperation in Europe49
- Research Publications, inc33
- Marana, Giovanni Paolo, 1642-169330
- Rand Corporation30
- Yale University. Library28
- European Science Foundation23
- Walter L. Pforzheimer Intelligence Collection (Beinecke Rare Book and Manuscript Library)22
- Cardini, Franco21
- Council of Europe20
- Duchhardt, Heinz19
- Bradshaw, William, fl. 170018
- Midgley, Robert, 1655?-172318
- Black, Jeremy, 1955-17
- United States. Congress. House. Committee on Foreign Affairs17
- Chartier, Roger, 1945-16
- Duby, Georges15
- Gehler, Michael15
- Robertson, William, 1721-179315
- United States. Congress. Senate. Committee on Foreign Relations15
- Centro italiano di studi sull'alto Medioevo14