London, Gollancz, 1972. First edition, first impression. Hardback. A near fine copy. The first UK hardback edition. A fantastic novel and a highlight of science fiction collecting. A little bumping to the spine tips, some offsetting to the endpapers. Jacket a little rubbed and creased but a pleasing copy overall. Larry Niven (1938-) is an American sf writer, Ringworld and its sequels, are his best known works and form part of his 'Known Space' universe. [12052, Hyraxia Books].