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- Royal Observatory, Cape of Good Hope54
- Royal Greenwich Observatory50
- United States. National Aeronautics and Space Administration46
- International Astronomical Union45
- Infobase, film distributor44
- Films for the Humanities & Sciences (Firm)32
- Infobase32
- Burritt, Elijah H. (Elijah Hinsdale), 1794-183828
- United States. Congress. House28
- Schlesinger, Frank, 1871-194327
- Harvard College Observatory24
- Harper, W. E. (William Edmund), 1878-194023
- United States Naval Observatory23
- ebrary, Inc23
- Proctor, Richard A. (Richard Anthony), 1837-188822
- Cannon, J. B. (John Beattie), 1879-194021
- Newcomb, Simon, 1835-190921
- Gyllenberg, Walter, 1886-19
- Auwers, A. (Arthur), 1838-191518
- Hamburger Sternwarte18