Fiction
Novels
The Sins of the Fathers (Analog 11/73-1/74; Berkley 1976; FoxAcre 2000)
Newton and the Quasi-Apple (Doubleday 1975; Popular Library 1977; FoxAcre 2001)
Lifeboat Earth (Berkley 1978; FoxAcre 2000)
Tweedlioop (Tor 1986; FoxAcre 2002)
Argonaut (Tor 2002)
Night Ride and Sunrise (Analog 7-8/15 to 11/15 and FoxAcre 2017)
Collected short fiction
Generation Gap and Other Stories (Five Star 2002, FoxAcre 2014)
Novellas and novelettes
"The Reluctant Ambassadors" (Analog 12/68)
". . . And Comfort to the Enemy" (Analog 7/69)
"Lost Newton" (Analog 9/70)
"The Unreachable Stars" (Analog 4/71)
"The Prophet" (Analog 4/72)
"His Loyal Opposition" (Analog 7/76)
"A Thrust of Greatness" (Analog 6/76)
"Caesar Clark" (Analog 7/77)
"Pinocchio" (Analog 9/77)
"Dark Age" (Analog 12/77)
"The Promised Land" (Analog 1/78)
"Mascots" (F&SF 2/82)
"War of Independence" (IASFM 8/82)
"The Easy Way" (Rigel, Summer 1983)
"Johnny Birdseed" (Analog 7/93)
"Good Intentions" (with Jack McDevitt; F&SF, 7/98) (Nebula Nominee)
"Generation Gap" (Artemis, Spring 2000) (Nebula and Hugo Nominee)
"The Final Nail" (Analog, 5-6/17)
Short stories
"A Flash of Darkness" (Analog 9/68)
"May the Best Man Win" (Analog 3/71l)
"I Remember Mahusudanaj" (Morpheus [Heidelberg College], Winter 1971)
"The Man Who Wasn't Beethoven" (Morpheus, Spring 1973)
"Panic" (Asimov's Jan/Feb 1978)
"A Midsummer Newt's Dream" (Asimov's 6/79)
"Camouflage" (Twilight Zone, 7/81)
"Tweedlioop" (Twilight Zone, 11/81)
"The Folks Who Live on the Hill" (anth. Habitats, ed. Susan Shwartz, DAW 1984)
"Floodgate" (Twilight Zone, 10/88)
"The Man on the Cover" (Analog, 10/90)
"Worthsayer" (Alfred Hitchcock's Mystery Magazine, 6/92; anth. More Whatdunits, ed. Mike Resnick, DAW 1993 )
"Not Even a Chimney" (anth. Christmas Forever, ed. David Hartwell, TOR 1993)
"The Parallels of Penzance" (with Michael A. Burstein; in Pieces of Six, World SF Convention Guest of Honor Anthology, 1998)
"The Emperor's Revenge" (anth. Once Upon a Galaxy, ed. Wil McCarthy, Martin H. Greenberg, and John Helfers, Daw 2002)
"Do Unto Others" [as by Kelvin Throop] (Analog, June 2004)
"Opportunity Knocks" (with Joyce Schmidt) (Analog 10/14)
"Throw Me a Bone" (Analog 5-6/17)