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- Oregon--History 37
- University of Oregon 37
- Lectures and lecturing 20
- Sagan, Carl, 1934-1996 20
- Thomas Condon 20
- Astronomy 19
- United States. National Aeronautics and Space Administration 19
- Tuition 4
- Buildings 3
- Dining rooms 3
- Dwellings 3
- Engineers 3
- Geology 3
- Laboratories 3
- Libraries 3
- Museums 3
- Rooms 3
- Workshops 3
- Debates and debating 1
- Jet Propulsion Laboratory (U.S.) 1