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Author/Creator
- Infobase, film distributor48
- Films for the Humanities & Sciences (Firm)32
- Infobase32
- United States. Congress. House28
- ebrary, Inc23
- Smithsonian Institution. Board of Regents18
- Trader Multimedia Inc. (Firm)18
- United States. Congress. Senate10
- United States. Naval Observatory10
- Oxford University Press9
- Institute of Physics (Great Britain), publisher8
- ProQuest (Firm)8
- National Academy of Sciences (United States)7
- A&E Networks (Firm)6
- Abbot, C.G., (Charles Greeley)6
- Cambridge Educational (Firm)6
- Making of America Project6
- PBS (Firm)6
- Hrdlicka, Ales5
- Smithsonian Institution5