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178 pages; Very Good condition. Light front hinge crease. No spine Creases. Light indent on front cover from writing on a piece of paper laid on front cover. Cover is lightly age tanned at the edges. Just a bit of shelf rub at cover edges. Solid, Clean. The comparatively new science of ethology, or the study of the behavior of different species, has give rise to a number of hypotheses about man's "instinctual" nature... Trade Paperback.