Masters of the Vortex (original title: The Vortex Blaster); the seventh novel of the Lensman series
Smith, E. E.(Edward Elmer),1890-1965.
St Albans Panther
1973
Originally published as 'The Vortex Blaster,' Hicksville: Gnome Press, 1960; and as 'Masters of the Vortex,' London: W.H. Allen, 1972