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- Oregon--History 46
- University of Oregon 46
- Lectures and lecturing 21
- Sagan, Carl, 1934-1996 21
- Thomas Condon 21
- United States. National Aeronautics and Space Administration 20
- Astronomy 19
- Buildings 11
- College campuses 8
- Tuition 4
- Dining rooms 3
- Dwellings 3
- Engineers 3
- Geology 3
- Laboratories 3
- Libraries 3
- Museums 3
- Rooms 3
- Workshops 3
- Debates and debating 1