| Bring Back Yesterday | 1961 |
| The Three Suns of Amara | 1961 |
| The Hamelin Plague | 1963 |
| Glory Planet | 1964 |
| The Coils of Time | 1964 |
| The Alternate Martians | 1965 |
| The Sea Beasts | 1971 |
| The Bitter Pill | 1974 |
| When The Dream Dies | 1981 |
| Kelly Country | 1983 |
| Frontier Of The Dark | 1984 |
The Empress Series |
|
| Empress of Outer Space | 1965 |
| Space Mercenaries | 1965 |
| Nebula Alert | 1967 |
The Commander Grimes Novels |
|
| Rendezvous on a lost world | 1961 |
| Rim of Space | 1961 |
| The Ship From Outside | 1963 |
| The Deep Reaches of Space | 1964 |
| Catch the Star Winds | 1969 |
| The Far Traveller | 1977 |
| To Keep the Ship | 1978 |
| Matilda's Stepchildren | 1979 |
| Star Loot | 1980 |
| The Anarch Lords | 1981 |
| The Wild Ones | 1984 |
| The Last Amazon | 1984 |
Grimes in Federation Service |
|
| Road To The Rim | 1967 |
| False Fatherland | 1968 |
| To Prime the Pump | 1971 |
| The Hard Way Up | 1972 |
| The Inheritors | 1972 |
| The Big Black Mark | 1975 |
| Broken Cycle | 1975 |
| Star Courier | 1977 |
Grimes in The Rim World |
|
| Into the Alternate Universe | 1964 |
| Contraband from Otherspace | 1967 |
| Rim Gods | 1969 |
| The Dark Dimensions | 1971 |
| Alternate orbits | 1971 |
| The Gateway to Never | 1972 |
| The Way Back | 1976 |
Collections |
|
| Beyond the Galactic Rim | 1963 |
| Commodore At Sea aka Alternate Orbits | 1971 |
| Commodore At Sea/Spartan Planet aka False Fatherland | 1979 |
| Up to the Sky in Ships: In & Out of Quandry | 1982 |
| From Sea to Shining Star | 1989 |
Anthologies Contribued To |
|
| The Best From Fantasy and Science Fiction 7th Series | 1958 |
| The Fantastic Universe Omnibus | 1960 |
| Worlds of If 129 | 1969 |
| Tales From The Planet Earth | 1971 |
| The Penguin Science Fiction Omnibus | 1973 |
| The Penguin World Omnibus of Science Fiction | 1977 |
| Science Fiction of the Fifties | 1979 |
| The Great SF Stories 7: 1945 | 1982 |
| The Great SF Stories 19: 1957 | 1989 |
| The Mammoth Book of Golden Age Science Fiction Short Novels of the 1940s | 1989 |
| Aliens and UFOs Extraterrestrial Tales From Asimov's Science Fiction and Analog Science Fiction and Fact | 1993 |
| Tomorrow Bites | 1995 |
| Space Stories | 1996 |
| Centaurus | 1999 |
Short Stories |
|
| "Giant Killer" | 1945 |
| "Castaway" writing as George Whitley | 1947 |
| "Haunt" | 1950 |
| "Finishing Touch" | 1952 |
| "Frontier of the Dark" | 1952 |
| "Jetsam" | 1953 |
| "Shadow Before" | 1954 |
| "As It Was In The Beginning" writing as S H M | 1955 |
| "Moonfall" | 1955 |
| "Not Quite The Noblest" | 1956 |
| "The Unharmonious Word" | 1956 |
| "Artifact" | 1957 |
| "The Cage" | 1957 |
| "Drift" | 1957 |
| "Ghost" | 1957 |
| "The Half Pair" | 1957 |
| "Sense of Wonder" | 1957 |
| "Critical Angle" | 1958 |
| "Fall of Knight" | 1958 |
| "Planet of Ill Repute" | 1958 |
| "What Would You Do?" | 1958 |
| "What's In A Name? writing as S H M | 1958 |
| "Chance Encounter" | 1959 |
| "Forbidden Planet" | 1959 |
| "The Idol" | 1959 |
| "The Key" | 1959 |
| "The Man Who Could Not Stop" | 1959 |
| "Precession" writing as George Whitley | 1959 |
| "Wet Paint" | 1959 |
| "The Word" writing as S H M | 1959 |
| "Seeing Eye" | 1960 |
| "All Laced Up" writing as George Whitley | 1961 |
| "Long Way" w/Susan Chandler | 1964 |
| "The Bird-Brained Navigator" | 1968 |
| "Last Dreamer" | 1968 |
| "The Rim Gods" | 1968 |
| "The Tin Fishes" | 1968 |
| "Hall of Fame" | 1969 |
| "The Kingsolving's Planet Irregulars" | 1969 |
| "The Soul Machine" | 1969 |
| "The Rub" | 1970 |
| "Sea Change" | 1970 |
| "The Wandering Buoy" | 1970 |
| "The Mountain Movers" | 1971 |
| "The Pied Potter" | 1971 |
| "The Sister Ships" | 1971 |
| "What You Know" | 1971 |
| "The Subtracter" | 1972 |
| "The Tin Messiah" | 1972 |
| "With Good Intentions" | 1972 |
| "The Last Hunt" | 1973 |
| "The Hairy Parents" | 1975 |
| "The Sleeping Beauty" | 1978 |
| "Journey's End" | 1979 |
| "Grimes and the Great Race" | 1980 |
| "The New Dimension" | 1981 |
| "Hindsight" | 1989 |
| "Man Alone" | 1989 |