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- SpringerLink (Online service)201
- Darwin, Charles, 1809-1882118
- ebrary, Inc86
- Linné, Carl von, 1707-177853
- Linné, Carl von, 1707-177848
- National Agricultural Library (U.S.)34
- Project Muse33
- Geological Survey (U.S.)32
- American Chemical Society. Division of Agrochemicals, sponsoring body31
- Geological Survey (U.S.), issuing body31
- American Chemical Society. Division of Agricultural and Food Chemistry, sponsoring body30
- Films for the Humanities & Sciences (Firm)27
- Infobase27
- United States23
- Vries, Hugo de, 1848-193523
- Encyclopaedia Britannica, Inc., publisher22
- MacDougal, Daniel Trembly, 1865-195822
- United States. Agricultural Research Service22
- Infobase, film distributor20
- Adam Matthew Digital (Firm), digitiser18