Materia
- Environmental History 7
- European Early Modern History History 6
- European Medieval History History 6
- History of Religion History 6
- American History: 19th Century History 5
- Ancient History 5
- British and Irish Early Modern History 5
- Cultural History History 5
- European Medieval History 5
- Imperialism and Colonialism 5
- Middle East History 5
- Middle East History History 5
- Political History 5
- American History: Civil War 4
- Archaeology 4
- Asian History History 4
- British and Irish Medieval History History 4
- European Early Modern History 4
- Historiography 4
- Russian and Former Soviet Union History 4