- Natural resources --United States1
- Photography --Exhibitions1
- Photography, Artistic--Exhibitions1
- Press--Soviet Union--Exhibitions1
- Proletariat1
- Protest movements --Italy1
- Public health--Soviet Union--Exhibitions1
- Radicalism1
- Riots --Italy --Bologna1
- Russian newspapers--Soviet Union--Exhibitions1
- Sanatoriums1
- Social classes1
- Social history --1960-19701
- Social psychology1
- Street art --Italy1
- Student movements --Italy1
- Students --Italy --Bologna --Political activity1
- Students --Italy --Political activity1
- Underground press publications --Germany1
- World War, 1914-1918 --Territorial questions --Croatia --Rijeka1