SF Encyclopedia Picture Gallery
Martin Gardner. Time Travel and Other Mathematical Bewilderments (New York: W H Freeman, 1988) [nonfiction: coll: Mathematical Games: hb/Lynn Pieroni]
From the collection of David Langford
Martin Gardner. Time Travel and Other Mathematical Bewilderments (New York: W H Freeman, 1988) [nonfiction: coll: Mathematical Games: hb/Lynn Pieroni]
From the collection of David Langford