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- United States. Central Intelligence Agency47
- Geological Survey (U.S.)20
- Engler, Adolf, 1844-19309
- Humboldt, Alexander von, 1769-18599
- Grisebach, A. (August), 1814-18798
- Schimper, A. F. W. (Andreas Franz Wilhelm), 1856-19018
- ebrary, Inc8
- Geological Survey (U.S.), issuing body7
- Thompson, Robert Stephen7
- Barbour, Michael G.6
- Drude, Oscar, 1852-19336
- Mohlenbrock, Robert H., 1931-6
- Project Muse6
- Walter, Heinrich, 1898-6
- Belcher, Edward, Sir, 1799-18775
- Bonpland, Aimé, 1773-18585
- Frodin, D. G.5
- Gaussen, Henri, 1891-5
- Good, Ronald, 1896-5
- Rübel, Eduard, 1876-19605