Pp. xviii, 431 pages; 35 plates (black-and-white photos), 69 text figures, 74 tables. Publisher's original gray cloth, lettered in green on the spine, color pictorial dust jacket, lg 8vo. A landmark study on the ecology and behavior of the mountain gorilla. "This remarkable study is the result of the African Primate Expedition (1959-60), whose prime concern was to observe the mountain gorilla in the eastern Congo and western Uganda" (from the jacket flap). This copy is signed by the author on the title page.