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- Astronomy 93
- Lectures and lecturing 88
- Oregon--History 88
- Sagan, Carl, 1934-1996 88
- Thomas Condon 88
- University of Oregon 88
- United States. National Aeronautics and Space Administration 62
- Africa, North 4
- Astronomy--Tables 4
- Manuscripts 4
- Manuscripts, Arabic 4
- Oregon, Western 4
- Planets 4
- Tables 4
- Jet Propulsion Laboratory (U.S.) 3
- Drawings 2
- National Space Science Data Center 2
- Telescopes 1