- Police-community relations1
- Politics and government3
- Poor--Medical care1
- Population geography1
- Preparatory schools5
- Presbyterian universities and colleges15
- Pressure groups3
- Prisoners--Civil rights1
- Prisons--Law and legislation2
- Private schools5
- Private universities and colleges2
- Professional associations2
- Prohibition1
- Propaganda, Anti-communist1
- Psychiatrists1
- Psychology, Comparative--Research1
- Psychology--Research2
- Public health2
- Public health--Societies, etc.1
- Public libraries460
- Public policy (Law)1
- Public safety1
- Public universities and colleges2
- Public welfare1
- Public welfare--Law and legislation1
- Quaker universities and colleges3
- Race discrimination1
- Reconstruction (1914-1939)4
- Recreation centers--Finance1
- Reformatories1
- Research grants23
- Research institutes4
- Rivers--Law and legislation1
- Rural credit1
- Rural libraries1
- Rural poor--Education1
- Rural schools1
- Sailors--Services for1
- Sanatoriums1
- School boards1
- School gardens1
- School improvement programs1
- School sports--Societies, etc.1
- Schools1
- Science--Societies, etc.1
- Science--Study and teaching1
- Scouting (Youth activity)1
- Sculptors1
- Segregation in education1
- Small colleges1
- Smoking cessation1
- Social problems1
- Social science literature--Editing1
- Social science literature--Publishing1
- Social sciences--Research6
- Social sciences--Research grants1
- Social sciences--Study and teaching2
- Social scientists1
- Social settlements2
- Social work with youth1