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Holt; Rineheart and Winston, 1981. hard cover + DJ. Ex library copy with usual stamps, stickers and barcode. Good book in very good unclipped and protected dustjacket. Chronicles Penny Patterson's 9 years as the dedicated teacher and surrogate mother to a gorilla named Hanabi-Ko, who became the subject of the longest continuous experiment ever undertaken to teach language to another species. A fascinating scientific exposition combined with a dramatic personal account.