Ace Books have published hundreds of science fiction titles, starting in 1953. Many of these were Ace Doubles (dos-à-dos format), but they also published many single volumes. Between 1953 and 1968, the books had a letter-series identifier; after that date they were given five digit numeric serial numbers. There are 693 numeric-series sf titles in the list below, but the list is very incomplete. The list given here gives a date of publication; in all cases this refers to the date of publication by Ace, and not the date of original publication of the novels. For more information about the history of these titles, see Ace Books, which includes a discussion of the serial numbering conventions used and an explanation of the letter-code system. 00075 SF John Jakes When the Star Kings Die 00078 SF Peter George (as Peter Bryant) Red Alert 00078 SF R.A. Salvatore The Dragons Dagger 00092 SF John Macklin Dwellers in Darkness 00093 SF Fred Saberhagen The Black Mountains 00094 SF Leigh Brackett The Big Jump 00104 SF Mack Reynolds Section G: United Planets 00106 SF John Macklin Passport to the Unknown 00107 SF James White The Secret Visitors 00108 SF Roger Zelazny Four For Tomorrow 00109 SF Mark S. Geston Lords of the Starship 00110 SF Fritz Leiber Swords in the Mist 00111 SF John W. Campbell Invaders from the Infinite 00119 SF William Shatner Teksecret 00125 SF Mary Staton From the Legend of Biel 00142 SF Steve Perry The Forever Drug (1995) 00153 SF Fritz Leiber Swords Against Wizardry 00265 SF Mack Reynolds Ability Quotient 00275 SF Donald A. Wollheim (ed.) Ace Science Fiction Reader (1971) 00289 SF William Shatner Tekpower 00348 SF Greg Bear Blood Music (1996) 00390 SF William Shatner Tekmoney 00950 SF Ron Goulart After Things Fell Apart (1970) 00958 SF Mack Reynolds After Utopia (1977) 01000 SF John Brunner Age of Miracles 01040 SF Larry Maddock Agent of T.E.R.R.A.#1: The Flying Saucer Gambit 01041 SF Larry Maddock Agent of T.E.R.R.A.#2: The Golden Goddess Gambit 01042 SF Larry Maddock Agent of T.E.R.R.A.#3: The Emerald Elephant Gambit 01043 SF Larry Maddock Agent of T.E.R.R.A.#4: The Time Trap Gambit 01066 SF Poul Anderson Agent of the Terran Empire 01501 SF Robert A. Heinlein The Worlds of Robert A. Heinlein 01570 SF Fletcher Pratt Alien Planet 01750 SF Robert E. Howard Almuric 01770 SF Leigh Brackett Alpha Centauri Or Die (1976) 02236 SF Stanley