Together 4 pages, 4to." /> EINSTEIN, ALBERT. Two autograph letters signed ("Papa") to Hans Albert Einstein and Eduard Einstein, and two autograph letters signed ("Papa") to Eduard Einstein, Berlin and n.p., 4 July 1920 - 15 July 1923 and n.d. [c. 1920-1921]. <I>Together 4 pages, 4to.</I> | Christie's