Subjects
- Natural history.1
- Natural resources.1
- New Deal, 1933-1939.1
- Paleontology.1
- Philanthropists -- Michigan -- Detroit.1
- Physicians -- Michigan -- Ann Arbor.1
- Physicians -- New York (State) -- New York.1
- Physics.1
- Picnics.1
- Prohibition -- United States.1
- Proximity fuzes.1
- Public health.1
- Railroad travel.1
- Real property -- Michigan -- Detroit.1
- Religion and science.1
- Rivers.1
- Scandinavian Americans.1
- Scientific expeditions -- United States.1
- Seed industry and trade -- Michigan -- Detroit.1
- Shells.1