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Robert Whittaker (ecologist) - Wikipedia
Robert H. Whittaker - Ecology - Oxford Bibliographies
Robert H. Whittaker (1920–1980): The man and his work
Robert H. Whittaker | American biologist | Britannica
Five Kingdoms, More or Less: Robert Whittaker and the Broad ...
Robert H. Whittaker (1920?1980): The man and his work
4.3.1: Kingdom Classification According to Whittaker