32 works in English-language magazines
| Date | Page | Type | Title | Magazine |
|---|---|---|---|---|
| September 1955 | 116 | Short Fiction | Blessed Are the Meek | Astounding Science Fiction, September 1955 |
| May 1956 | 158 | Essay | Letter (Astounding, May 1956) | Astounding Science Fiction, May 1956 |
| May 1956 | 38 | Short Fiction | Technological Retreat | The Magazine of Fantasy and Science Fiction, May 1956 |
| February 1957 | 86 | Short Fiction | The Inferlab Project | The Magazine of Fantasy and Science Fiction, February 1957 |
| April 1957 | 76 | Short Fiction | The Status Quo Peddlers | The Magazine of Fantasy and Science Fiction, April 1957 |
| May 1957 | 16 | Short Fiction | The Demancipator | Science Fiction Stories, May 1957 |
| June 1957 | 59 | Short Fiction | Rescue | The Magazine of Fantasy and Science Fiction, June 1957 |
| December 1957 | 97 | Short Fiction | Renaissance | The Magazine of Fantasy and Science Fiction, December 1957 |
| April 1958 | 101 | Short Fiction | A Pound of Prevention | Infinity Science Fiction, April 1958 |
| February 1959 | 78 | Short Fiction | The Misfit | The Magazine of Fantasy and Science Fiction, February 1959 |
| November 1959 | 25 | Short Fiction | "From Caribou to Carry Nation" | The Magazine of Fantasy and Science Fiction, November 1959 |
| January 1960 | 108 | Short Fiction | The Galactic Calabash | The Magazine of Fantasy and Science Fiction, January 1960 |
| April 1960 | 35 | Short Fiction | Ringer | The Magazine of Fantasy and Science Fiction, April 1960 |
| August 1960 | 39 | Short Fiction | The Sign of the Goose | The Magazine of Fantasy and Science Fiction, August 1960 |
| May 1961 | 65 | Short Fiction | The Country Boy | The Magazine of Fantasy and Science Fiction, May 1961 |
| April 1963 | 102 | Short Fiction | The World Must Never Know | The Magazine of Fantasy and Science Fiction, April 1963 |
| June 1964 | 78 | Short Fiction | The Third Bubble | The Magazine of Fantasy and Science Fiction, June 1964 |
| September 1964 | 34 | Short Fiction | From Caribou to Carry Nation | Venture Science Fiction [UK], September 1964 |
| May 1970 | 74 | Short Fiction | Nobody Believes an Indian | The Magazine of Fantasy and Science Fiction, May 1970 |
| January 1971 | 125 | Review | The Ship That Sailed the Time Stream | If, January-February 1971 |
| January 1972 | 168 | Review | Chapayeca | Analog Science Fiction/Science Fact, January 1972 |
| April 1972 | 104 | Review | Chapayeca | The Magazine of Fantasy and Science Fiction, April 1972 |
| January 1973 | 145 | Short Fiction | One Plus One Equals Eleven | Analog Science Fiction/Science Fact, January 1973 |
| July 1974 | 170 | Short Fiction | Tube | Worlds of If, July-August 1974 |
| June 1975 | 14 | Review | The Aluminum Man | Delap's F & SF Review, June 1975 |
| January 1977 | 9 | Essay | Letter to The Bulletin of the Science Fiction Writers of America, January 1977 | The Bulletin of the Science Fiction Writers of America, January 1977 |
| November 1980 | 10|10.4 | Review | The Man Who Corrupted Earth | Ares, #5 November 1980 |
| August 1981 | 112 | Short Fiction | Written on the Water | Isaac Asimov's Science Fiction Magazine, August 31, 1981 |
| July 1984 | 100 | Essay | The Leprechauns Are Alive and Well in Spite of the Evil Eye | Amazing Stories, July 1984 |
| August 1984 | 9 | Review | The Takeover | Fantasy Review, August 1984 |
| December 1986 | 33 | Review | The Black Magician | Fantasy Review, December 1986 |
| February 1987 | 180 | Review | The Cunningham Equations | Analog Science Fiction/Science Fact, February 1987 |
14 English-language books
| Year | Type | Title | Author(s) |
|---|---|---|---|
| 1965 | Omnibus | The Ship That Sailed the Time Stream / Stranger Than You Think | G. C. Edmondson |
| 1970 | Novel | The Ship That Sailed the Time Stream | G. C. Edmondson |
| 1971 | Novel | Chapayeca | G. C. Edmondson |
| 1972 | Novel | Blue Face | G. C. Edmondson |
| 1974 | Novel | T.H.E.M. | G. C. Edmondson |
| 1975 | Novel | The Aluminum Man | G. C. Edmondson |
| 1980 | Novel | The Man Who Corrupted Earth | G. C. Edmondson |
| 1981 | Novel | To Sail the Century Sea | G. C. Edmondson |
| 1984 | Novel | The Takeover | G. C. Edmondson & C. M. Kotlan |
| 1986 | Novel | The Black Magician | G. C. Edmondson & C. M. Kotlan |
| 1986 | Novel | The Cunningham Equations | G. C. Edmondson & C. M. Kotlan |
| 1987 | Novel | Maximum Effort | G. C. Edmondson & C. M. Kotlan |
| 2007 | Chapbook | Blessed Are the Meek | G. C. Edmondson |
| 2023 | Chapbook | A Pound of Prevention | G. C. Edmondson |
SF author who also wrote westerns as "Kelly P. Gast", "J. B. Masterson" and "Jake Logan". According to Robert Reginald's research, the California death index indicates that his legal name was "Garry Cotton Edmondson" and he was born in Washington state. Many secondary sources list his legal name as "José Mario Garry Ordoñez Edmondson y Cotton" and the place of birth as Rachauchitian, Mexico, or, in the case of ''Stellar #5: Science-Fiction Stories'', Guatemala, but that was apparently a hoax.