Tunnel in the Sky
Robert A. Heinlein
The Avatar
Poul Anderson
Earthgate
J. Brian Clarke
Starrigger
John DeChancie
Skyway (1)
Red Limit Freeway
Skyway (2)
Paradox Alley
Skyway (3)
The Silent Tower
Barbara Hambly
The Windrose Chronicles (1)
The Kingdom of Kevin Malone
Suzy McKee Charnas
One Jump Ahead
Mark L. Van Name
Jon & Lobo (1)