2 pages, 8vo, 220 x 142 mm. (9 x 5 7/8 in.), page 2 with two carefully drawn and labelled problems in plane geometry, some lines of text lightly underlined in purple pencil, tiny tear in one corner, not affecting text." /> EINSTEIN, ALBERT. Autograph letter signed ("Papa") to Hans Albert Einstein, n.p., n.d. [1917?]. <I>2 pages, 8vo, 220 x 142 mm. (9 x 5 7/8 in.), page 2 with two carefully drawn and labelled problems in plane geometry, some lines of text lightly underlined in purple pencil, tiny tear in one corner, not affecting text</I>. | Christie's