This Horror Hall of Fame, like Silverberg's first Fantasy Hall of Fame, is the result of a poll conducted among members of the World Fantasy convention, though in this case the poll was conducted at the 1981 convention, and the results include three stories published as late as 1981, so it's not strictly a supplement to the World Fantasy Awards as the earlier Fantasy Hall of Fame was.
“The Fall of the House of Usher”,
Edgar Allan Poe
(Burton's Gentlemens Magazine Sep 1839)