| Chinese history and philosophy | 6 |
| Urban, Neighborhood, and Segregation Studies | 6 |
| Race, History, and American Society | 5 |
| Urban Transport and Accessibility | 5 |
| African history and culture studies | 4 |
| American Environmental and Regional History | 4 |
| Global Maritime and Colonial Histories | 4 |
| Geographies of human-animal interactions | 4 |
| History of Science and Medicine | 3 |
| Political and Economic history of UK and US | 3 |
| Indigenous Studies and Ecology | 3 |
| Vietnamese History and Culture Studies | 3 |
| Archaeology and Natural History | 3 |
| Gun Ownership and Violence Research | 3 |
| Policing Practices and Perceptions | 3 |
| Hong Kong and Taiwan Politics | 3 |
| Latin American and Latino Studies | 2 |
| Foucault, Power, and Ethics | 2 |
| Traffic and Road Safety | 2 |
| Urban Green Space and Health | 2 |