Robert Silverberg/ Stefan Rudnicki (NRT)
(6)
Robert Silverberg/ Bronson Pinchot (NRT)
(3)
Robert Silverberg/ Grover Gardner (NRT)
(2)
Alfred Bester/ Robert Silverberg/ Byron Preiss/ Keith R. A. DeCandido
(1)
Bryan Thomas Schmidt, Robert Silverberg, David Weber, Jack Campbell, Elizabeth Moon
(1)
Don Elliott/ Robert Silverberg (CON)/ Michael Hemmingson (AFT)
(1)
Don Elliott/ Robert Silverberg (INT)
(1)
Jack Dann/ Robert Silverberg (INT)
(1)
John P. Bilezikian (EDT)/ Robert Marcus (EDT)/ Michael A. Levine (EDT)/ Claudio Marcocci (EDT)/ Shonni J. Silverberg (EDT)
(1)
L. Ron Hubbard (CRT)/ Orson Scott Card/ Mike Resnick/ Robert Silverberg/ Val Lindahn
(1)
Laura Zuccheri (ILT)/ Robert Silverberg/ Philippe Thirault
(1)
Martin Harry Greenberg (EDT)/ Robert Silverberg (INT)
(1)
Philip Wylie/ Robert Silverberg (INT)
(1)
Robert Silverberg (EDT)/ Neil Gaiman/ Anne McCaffrey/ Tad Williams/ Robin Hobb/ Robert Silverberg/ Raymond E. Feist
(1)
Robert Silverberg (EDT)/ Terry Brooks/ George R. R. Martin/ Diana Gabaldon/ Orson Scott Card/ Elizabeth Haydon
(1)
Robert Silverberg (EDT)/ Ursula K. Le Guin (CON)/ Connie Willis (CON)/ Megan Arkenberg (CON)/ Brian W. Aldiss (CON)
(1)