[Mark Twain (subject)]. [Jacob Blanck]. A Supplement to a "Bibliography of Mark Twain". New York: Privately printed, 1939. First edition. Octavo (8.75 x 6.25 inches; 220 x 160 mm.).  pages. Four in-text illustrations. Bifolium with cover-title, printed in red and black; fore-edge untrimmed. Faint marginal tanning, slightly darker on the fold. Nearly fine. A history of the "curved fly" illustration in the first edition of Huckleberry Finn with facsimiles of each state of the plate. (#10254).