Subjects
- Presidents -- United States -- Election -- 1920.1
- Presidents -- United States -- Election -- 1924.1
- Presidents -- United States -- Election -- 1928.1
- Presidents -- United States -- Election -- 1932.1
- Presidents -- United States -- Election -- 1936.1
- Presidents -- United States -- Election -- 1940.1
- Presidents -- United States -- Election -- 1944.1
- Presidents -- United States -- Election -- 1948.1
- Presidents -- United States -- Election -- 1952.1
- Presidents -- United States -- Election -- 1960.1
- Presidents -- United States -- Election -- 1964.1
- Printing industry.1
- Prison facilities -- Michigan -- Jackson.1
- Professors.1
- Prohibition -- United States.1
- Project Telstar.1
- Publicity.1
- Racquets (Game)1
- Radar.1
- Radio broadcasting -- Michigan.1