. "worldcon" . . . . "WorldCon Science Fiction Convention" . . . . . . "World Science Fiction Convention" . "World Science Fiction Convention (World Con)" . . . "The World Science Fiction Convention" . . "World SF Convention" . . "Worldcon" . "World Science Fiction Conventions" . . "1953 World SF Convention" . . "World SF Conventions" . . "Worldcon Guest of Honor" . . "Worldcon#World Science Fiction Society" . "convention's masquerade" . "Worldcon" . "World Science Fiction Society" . . . "18th World Science Fiction Convention" . . "1939-07-02" . "World Science Fiction convention" .