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Subjects
- Astronomical observatories.1
- Astronomy.1
- Botany.1
- Double stars.1
- Evolution -- Religious aspects.1
- Expeditions and surveys.1
- Indians of South America.1
- Naturalists -- Religious life -- Michigan -- Ann Arbor.1
- Offices.1
- Philosophy.1
- Picnics.1
- Scientific expeditions.1
- Sunspots.1
- Telescopes.1
- Travelers.1
- Voyages and travels.1
- World War, 1939-1945.1
- Zoology.1