1 page, 4to, 280 x 215 mm. (11 x 8½ in.)." /> EINSTEIN, ALBERT. Autograph letter signed ("Papa") to Hans Albert Einstein and his wife, Frieda, n.p., 7 January 1939. <I>1 page, 4to, 280 x 215 mm. (11 x 8½ in.)</I>. | Christie's