From PR release: This book includes thirty-one speeches presented at the Worldcon, ranging from Frank R. Paul's speech at the very first Worldcon in 1939 through Christopher Priest's speech at the 2005 Worldcon in Glasgow. Among the science fiction luminaries included are Robert Heinlein, E.E. "Doc" Smith, John W. Campbell, Harlan Ellison, Fritz Leiber, Kate Wilhelm, and more.

The book has it's own webpage.

(Source: ISFiC Press)