10c American Authors Samuel L. Clemens (Mark Twain) first day cover
February 13, 1940, first day issue commemorative cover for the American Authors issue in the Famous American issues series. From Hannibal, Missouri, and addressed to James A. Farley, Postmaster General. Signed by four individuals: Lloyd C. Stark[?], governor; James Farley; Felix Schaul; and illegible signature. Cover highlights Samuel L. Clemens.