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keyword: Animal intelligence – 6 free books.
These books are included in Project Gutenberg. They are archived and can be improved at GITenberg.
Thomas G. (Thomas George) Gentry
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The Mental Life of Monkeys and Apes: A Study of Ideational Behavior
Robert Mearns Yerkes
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Animal Intelligence The International Scientific Series, Vol. XLIV.
George John Romanes
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