Billion-Dollar Brain

A US book-club issue exists and is common: it is blind-stamped or dot-marked to the rear board, lacks the price at the jacket flap, is slightly smaller than the trade issue, and is bulked on cheaper paper. Because the Cape edition post-dates the Putnam, a Cape copy is not a book-club tell but is simply a later (British first) edition. Later Cape impressions add an impression line under the "First published 1966" statement.