Up the Walls of the World
James Tiptree, Jr.
Up the Wall
Esther M. Friesner
Up the Rainbow
Susan Casper
Up the Mountain Coming Down Slowly
Dave Eggers
Up the Line
Robert Silverberg
Up in Smoke
Katie MacAlister
Silver Dragons (2)
Up in a Heaval
Piers Anthony
Xanth (26)
Up Around the Bend
Paul Di Filippo
Up and Down
Algernon Blackwood
Unzipped
Steven J. Dines
The Unwritten Girl
James Bow
The Unwritten Books (1)
Unworthy
Kirsten Beyer
VOY Unnumbered (22)
Unwise Child
Randall Garrett
Unwirer
Cory Doctorow & Charles Stross
Unwind
Neal Shusterman
Unwind Dystology (1)
Unwillingly to School
Pauline Ashwell
The Unwilling Warlord
Lawrence Watt-Evans
Legends of Ethshar (3)
Unwelcomed Visitor
William Morrison