SF Encyclopedia Picture Gallery
Mark Twain. What Is Man? And Other Philosophical Writings (Berkeley, California: University of California Press, 1973) [nonfiction/fiction: coll: exp vt of What Is Man? and Other Essays (1917): containing newly edited texts and other material: edited with an introduction by Paul Baender: hb/nonpictorial]
Image courtesy of Clute Science Fiction Library at Telluride