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Other views: | Summary Awards Chronological |
Novels
- A Study in Sorcery (1989)
- Button Bright (1990)
- First Cycle (1982) with H. Beam Piper
- Perchance (1989)
- Pluribus (1975)
- Psi Hunt (1980)
- Star Griffin (1987)
- Ten Little Wizards (1988)
- Ten Years to Doomsday (1964) with Chester Anderson
- The Last President (1980) with S. W. Barton
- The Princes of Earth (1978)
- The Unicorn Girl (1969)
- The Whenabouts of Burr (1975)
- Tomorrow Knight (1976)
- Transmission Error (1970)
- Images, Conceits & Lollygags (2003)
- The Trials of Quintilian: Three Stories of Rome's Greatest Detective (2011)
- Victorian Villainy: A Collection of Moriarty Stories (2011)
- Lisa Kane / The Princes of Earth (2011) [O] with Richard A. Lupoff
- Victorian Villainy: A Collection of Moriarty Stories / The Trials of Quintilian: Three Stories of Rome's Greatest Detective (2011) [O]
- My Sherlock Holmes: Untold Stories of the Great Detective (2004)
- Sherlock Holmes: The Hidden Years (2004)
- A Brief Dance to the Music of the Spheres (1983)
- A Matter of Taste (1973)
- Blind Justice (1993)
- Bond of Brothers (1965)
- Elementary (1964) with Laurence M. Janifer
- Fimbulsommer (1970) with Randall Garrett
- Four Hundred Slaves (2005)
- Go Karts for God (2012)
- Great Caesar's Ghost (2003)
- In the Blood (1995)
- Lily and the Dragon (2014)
- Please State My Business (1965)
- Poor Joe (1990) with Avram Davidson
- Reichenbach (2004)
- Small World (1973)
- Spadework (1968)
- Specula (1972)
- Splash (2012) with Scott A. Cupp and Paul Di Filippo and James Patrick Kelly and Richard A. Lupoff and Michael Mallory and Don Webb
- The Picture of Oscar Wilde (2008)
- The Rite Stuff (2004)
- The Stolen Saint Simon (2000)
- Think Only This of Me (1973)
- Vanishing Act (1976) with Bill Pronzini
- Years Ago and in a Different Place (2003)
- A Brief Introduction (The Infernal Device & Others) (2001)
- Foreword (Images, Conceits & Lollygags) (2003)
- Foreword (Lisa Kane) (2010)
- Foreword (The Redward Edward Papers) (1978)
- Introduction (A Study in Sorcery) (2011)
- Introduction (Sherlock Holmes: The Hidden Years) (2004)
- Introduction (Ten Little Wizards) (2011)
- Introduction (The Best of Avram Davidson) (1979)
- Introduction (The Man Who Walked Through Cracks) (2019)
- Introduction (The Trials of Quintilian) (2011)
- Introduction (Victorian Villainy) (2011)
- Introduction (Writer at Large) (1998)
- Philip K. Dick, an Appreciation (1983)
- Professor Philip Klass: An Appreciation (1981)
- Prologue (The Unicorn Girl) (1969)
- T. A. W. (1998)
- Lovecraft: A Biography (1975) by L. Sprague de Camp
Non-Genre Titles
Novels
- A Plague of Spies (1969)
- Death by Gaslight (1982)
- Mission: Tank War (1968)
- Mission: Third Force (1967)
- The Empress of India (2006)
- The Great Game (2001)
- The Infernal Device (1979)
- Who Thinks Evil (2014)
- The Infernal Device & Others (2001) [O/1+2+nt]
- The Paradol Paradox (2001)