2 pages, 4to, 277 x 215 mm. (10¾ x 8½ in.). " /> EINSTEIN, ALBERT. Autograph letter signed ("Papa") to Hans Albert Einstein, Princeton, 15 November 1936. <I>2 pages, 4to, 277 x 215 mm. (10¾ x 8½ in.)</I>. | Christie's