Subject
- American literature22
- American newspapers21
- Diplomatic relations21
- Art20
- Business20
- Corporations20
- Economics20
- Commerce19
- Literature19
- World politics19
- Motion pictures18
- International relations17
- Philosophy17
- Religion17
- History, Modern16
- Manuscripts16
- World War, 1939-194516
- Colonies15
- Economic history15
- Architecture14