400 - Turing (Sara) Alan M. Turing, first edition, photographic portrait frontispiece, 6 full-page illustrations on 4 sheets, original cloth, very light bumps and browning to spine ends, spot to head of spine, dust-jacket, slight browning, rubbed to spine ends and extremities, minor chipping to spine ends and at corners, light scuffing on joints, otherwise a very good example, 8vo, Cambridge, W. Heffer & Sons, Ltd., 1959.

Turing (Sara) Alan M. Turing, first edition, photographic portrait frontispiece, 6 full-page illustrations on 4 sheets, original cloth, very light bumps and browning to spine ends, spot to head of spine, dust-jacket, slight browning, rubbed to spine ends and extremities, minor chipping to spine ends and at corners, light scuffing on joints, otherwise a very good example, 8vo, Cambridge, W. Heffer & Sons, Ltd., 1959. *** A rare copy of this biography and memorial of the pioneering computer scientist, mathematician and code-breaker, written by his mother. It was published in a relatively small number of copies, possibly as few as 500. Sara Turing maintains that her son's death was an accident, rather than suicide. The majority of the bibliography lists Alan Turing's works.