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- ebrary, Inc64
- Asimov, Isaac, 1920-199225
- Safari Books Online (Firm)22
- Haldeman-Julius Company, publisher15
- Project Muse13
- Sagan, Carl, 1934-199612
- Gribbin, John R.10
- Time-Life Books10
- McCabe, Joseph, 1867-19559
- Avise, John C.8
- Jastrow, Robert, 1925-20088
- Moore, Patrick8
- ProQuest (Firm)8
- Barrow, John D., 1952-7
- Credo Reference (Firm), distributor7
- Devlin, Keith J.7
- Reilly, Philip, 1947-7
- Samuel R. Delany Library (Beinecke Rare Book and Manuscript Library). Reading Library7
- Stewart, Ian, 1945-7
- American Museum of Natural History6