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- Astronomical observatories.3
- Astronomy.1
- Bridges.1
- Broadcasting.1
- Coal mining.1
- Double stars.1
- Engineering.1
- Engineers -- Michigan -- Ann Arbor.1
- Industry and education.1
- Laboratories.1
- Mining.1
- Radio broadcasting -- United States.1
- Research.1
- Signal towers.1
- Streets -- Michigan -- Detroit.1
- Sunspots.1
- Telescopes.1
- Towers.1
- Women -- Michigan -- Ann Arbor.1
- Women college students -- Michigan -- Ann Arbor.1