34 years? That's a lot of books. Some of the ones that could be on the list are:
Gordon R. Dickson, The Dragon and the George
Stephen R. Donaldson, The Chronicles of Thomas Covenant the Unbeliever
Michael Moorcock, Elric series
Stephen King, The Stand
Elizabeth A. Lynn, The Dancers of Arun
Patricia A. McKillip, Harpist in the Wind (Riddlemaster of Hed)
Gene Wolfe, Soldier of the Mist
John Crowley, Little, Big
John M. Ford, The Dragon Waiting
R.A. MacAvoy, Lens of the World
Jack Vance, Lyonesse
Robert Holdstock, Mythago Wood
Barry Hughart, Bridge of Birds
Stephen King & Peter Straub, The Talisman
Clive Barker, Weaveworld
C.J. Cherryh, Fortress in the Eye of Time
Neil Gaiman, American Gods
China Mieville, Perdido Street Station
Robert Jordan, Wheel of Time series
George R.R. Martin, Song of Ice and Fire series
Anne Rice, Interview with a Vampire
Patrick Suskind, Perfume
Terry Bisson, Talking Man
Tim Powers, Declare, The Anubis Gates
Robert R. McCammon, Usher’s Passing
Charles de Lint, The Little Country
Peter Straub, Koko
James P. Blaylock, The Last Coin
Jonathan Carroll, Outside the Dog Museum
Terri Windling, The Wood Wife
James Morrow, Only Begotten Daughter
Ellen Kushner, Thomas the Rhymer
Guy Gavriel Kay, Tigana
Terry Pratchett, Small Gods
Stephen Brust, Vlad Taltos series
Stephen R. Boyett, Ariel
Glen Cook, The Black Company
Emma Bull, Bone Dance
Toni Morrison, Beloved
Octavia Butler, Kindred
Kim Newman, Anno Dracula
Jane Yolen, Briar Rose
Kathe Koja, Skin
Michael Swanwick, The Iron Dragon's Daughter
Elizabeth Hand, Waking the Moon
Graham Joyce, The Tooth Fairy
Mark Helprin, A Winter’s Tale
Sean Stewart, Galveston, Mockingbird
Peter S. Beagle, Tamsin
Phillip Pullman, His Dark Materials
J.K. Rowling, Harry Potter
Lemony Snickett, A Series of Unfortunate Events
Piers Anthony, A Spell for Chameleon, On a Pale Horse
Katherine Kurtz, Deryni Rising
Robin Hobb, Assassin’s Apprentice
Roger Zelazny, Chronicles of Amber series
Marion Zimmer Bradley, The Mists of Avalon
Sherri S. Tepper, Jinian Footseer
Ursula LeGuin, Earthsea series
Richard Adams, Watership Down
William Goldman, The Princess Bride
Tad Williams, Memory, Sorrow & Thorn series
Brian Jacques, Redwall
Michael Ende, The Neverending Story
Diana Wynne Jones, Howl’s Moving Castle