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Author/Creator
- SpringerLink (Online service)564
- ebrary, Inc162
- Huxley, Thomas Henry, 1825-189547
- Library of Congress. Congressional Research Service47
- United States. Congress. House47
- Spencer, Herbert, 1820-190338
- Thomson, J. Arthur (John Arthur), 1861-193337
- Yale University37
- Project Muse31
- Huxley, Julian, 1887-197530
- Jeon, Kwang W.30
- Smithsonian Institution. Board of Regents27
- Spallanzani, Lazzaro, 1729-179924
- Driesch, Hans, 1867-194123
- ProQuest (Firm)22
- Baitsell, George Alfred, 1885-197121
- Oxford University Press21
- Systematics Association19
- Henderson, I. F. (Isabella Ferguson)18
- Society of Photo-Optical Instrumentation Engineers18