Energy, Government, and Defense magazines
- Prisoner of War Camps, United States
- Prisons and Prisoners of War, 1816–1900
- Profiteering
- Propaganda, 1898–1945
- Protecting and Preparing
- Quasi-War and the Rise of Political Parties
- Race and the Military
- Racial Profiling and the Battle Against Terrorism
- Radio and the Power of Broadcasting
- Recreation and Social Life
- Red Badge of Courage
- Red Cross, American
- Red Scare
- Regional Migration, World War I and World War II
- Religion and Revolution
- Religion, Civil War
- Religion, World War II
- Reports, Speeches, and Declarations
- Republican Womanhood
- Republicanism and War