Clever Hans (the horse of Mr. Von Osten) : a contribution to experimental animal and human psychology / by Oskar Pfungst ; translated from the German by Carl L. Rahn.

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Rahn, Carl Leo, 1881-

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Clever Hans (the horse of Mr. Von Osten) : a contribution to experimental animal and human psychology / by Oskar Pfungst ; translated from the German by Carl L. Rahn.