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Author/Creator
- SpringerLink (Online service)475
- Adam Matthew Digital (Firm), digitiser382
- United States. National Aeronautics and Space Administration183
- Society of Photo-optical Instrumentation Engineers95
- Space Telescope Science Institute (U.S.)78
- SPIE Digital Library77
- Society of Photo-Optical Instrumentation Engineers61
- Infobase, film distributor51
- SPIE (Society)48
- Films for the Humanities & Sciences (Firm)46
- Infobase46
- Library of Congress. Congressional Research Service43
- American Astronomical Society35
- United States. Congress. House34
- United States33
- George C. Marshall Space Flight Center30
- Institute of Physics (Great Britain), publisher28
- Yale University26
- Project Muse24
- United States. Naval Observatory24