Ace Books published its F-series of books, priced at 40 cents, from 1960 to 1967. * F-101 NA Joan Sargent Cruise Nurse / Margaret Howe Calling Dr. Merriman (1960) * F-102 MY The Flying Eye / Never Forget, Never Forgive (1961) * F-103 WE Harry Whittington A Trap For Sam Dodge / High Thunder (1961) * F-104 SF Kenneth Bulmer No Man's World / Poul Anderson Mayday Orbit (1961) * F-105 SF William A. P. White (as Anthony Boucher) (ed.) The Best From Fantasy And Science Fiction, Fifth Series * F-106 WE Brian Garfield Justice At Spanish Flat / The Gun From Nowhere (1961) * F-107 MY My Pal, The Killer / John Trinian Scratch A Thief (1961) * F-108 SF The Light of Lilith / Damon Knight The Sun Saboteurs (1961) * F-109 SF Andre Norton Storm Over Warlock (1961) * F-110 WE Ray Hogan Track