Private schools, [585], [617], [651a]

Proctor, H. H., [1758]

Proctor, Samuel D., [366]

Professions, [444], [492]

Progressivism, [371]

Protestant churches, [1674], [1684], [1690].

See also names of individual denominations, e.g., [Baptists], [Methodists]

Prothro, James W., [1431]

Proudfoot, Merrill, [1536]

Psychology, [381], [568], [589], [789], [1293]- [1294], [1296]- [1297], [1299], [1306], [1309], [1486], [1513]