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- Germany. Auswärtiges Amt78
- United States. Department of State43
- ebrary, Inc42
- Project Muse35
- United States. Congress. Senate. Committee on Foreign Relations33
- Germany. Auswärtiges Amt30
- Hitler, Adolf, 1889-194530
- United States. President (1913-1921 : Wilson)28
- Germany27
- Rohrbach, Paul, 1869-195625
- United States24
- Bülow, Bernhard, Fürst von, 1849-192922
- Great Britain. Foreign Office22
- Lichnowsky, Karl Max, Fürst von, 1860-192822
- Reventlow, E. (Ernst), Graf, 1869-194322
- Bernhardi, Friedrich von, 1849-193021
- Walter L. Pforzheimer Intelligence Collection (Beinecke Rare Book and Manuscript Library)20
- Oxford University Press17
- ProQuest (Firm)17
- Jäckh, Ernst15