Subject
- Campaigns67
- Foreign relations64
- Atrocities63
- Religion63
- Psychological aspects57
- Public opinion51
- Causes50
- Emigration and immigration49
- Heads of state49
- Protestant churches49
- Political aspects46
- Childhood and youth45
- History and criticism45
- Religious aspects45
- Sources44
- Intellectual life43
- Influence42
- Jews, German42
- Constitutional history41
- Women41