In 1976, the panel felt that no truly outstanding novels had been published the previous year, and so the award was given retrospectively to a novel published in 1970.
In 1994, no award was given; this was due to a breakdown in the nomination process, not because no novel was judged worthy.
The award ceremony has been held in a number of places over the years, but since 1979 has been held at the University Of Kansas , where it has become the focus of a weekend-long conference that also includes discussions of the writing, illustration, publishing, teaching, and criticism of science fiction.
- - '' Beyond Apollo '', Barry N. Malzberg
- (tie) - '' Rendezvous With Rama '', Arthur C. Clarke ; '' Malevil '', Robert Merle
- - '' Flow My Tears, The Policeman Said '', Philip K. Dick
- - '' The Year Of The Quiet Sun '', Wilson Tucker (special retroactive award)
- - '' The Alteration '', Kingsley Amis
- - '' Gateway '', Frederik Pohl
- - '' Gloriana '', Michael Moorcock
- - '' On Wings Of Song '', Thomas M. Disch
- - '' Timescape '', Gregory Benford
- - '' Riddley Walker '', Russell Hoban
- - ''Helliconia Spring'', Brian W. Aldiss
- - '' The Citadel Of The Autarch '', Gene Wolfe
- - '' The Years Of The City '', Frederik Pohl
- - '' The Postman '', David Brin
- - ''A Door into Ocean'', Joan Slonczewski
- - '' Lincoln's Dreams '', Connie Willis
- - '' Islands In The Net '', Bruce Sterling
- - '' The Child Garden '', Geoff Ryman
- - '' Pacific Edge '', Kim Stanley Robinson
- - ''Buddy Holly Is Alive and Well on Ganymede'', Bradley Denton
- - ''Brother to Dragons'', Charles Sheffield
- - No award
- - '' Permutation City '', Greg Egan
- - '' The Time Ships '', Stephen Baxter
- - ''Fairyland'', Paul McAuley
- - '' Forever Peace '', Joe Haldeman
- - ''Brute Orbits'', George Zebrowski
- - '' A Deepness In The Sky '', Vernor Vinge
- - '' Genesis '', Poul Anderson
- (tie) - '' Terraforming Earth'', Jack Williamson ; ''The Chronoliths'', Robert Charles Wilson
- - ''Probability Space'', Nancy Kress
- - ''Omega'', Jack McDevitt
- - ''Market Forces'', Richard Morgan
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