Helfers, John
Chronological Checklist
- Black Cats and Broken Mirrors (New York: DAW Books, 1998) with Martin H Greenberg
- Alien Abductions (New York: DAW Books, 1999) with Martin H Greenberg
- Future Crimes (New York: DAW Books, 1999) with Martin H Greenberg
- Warrior Fantastic (New York: DAW Books, 2000) with Martin H Greenberg
- Star Colonies (New York: DAW Books, 2000) with Ed Gorman (Greenberg anonymous) and Martin H Greenberg
- Cloak and Dagger (New York: Berkley Jam, 2001) with Russell Davis
- The Valdemar Companion (New York: DAW Books, 2001) with Denise Little
- The Mutant Files (New York: DAW Books, 2001) with Martin H Greenberg
- Villains Victorious (New York: DAW Books, 2001) with Martin H Greenberg
- Knight Fantastic (New York: DAW Books, 2002) with Martin H Greenberg
- Once Upon a Galaxy (New York: DAW Books, 2002) with Martin H Greenberg and Wil McCarthy
- Future Wars (New York: DAW Books, 2003) with Martin H Greenberg
- Deep in the Dark (New York: ibooks, 2004)
- Space Stations (New York: DAW Books, 2004) with Martin H Greenberg
- Siege of Night and Fire (Waterville, Maine: Five Star, 2005)
- In the Shadow of Evil (New York: DAW Books, 2005) with Martin H Greenberg
- Aftershock (New York: New American Library/Roc, 2006) with Jean Rabe
- Slipstreams (New York: DAW Books, 2006) with Martin H Greenberg
- The Vorkosigan Companion (New York: Baen Books, 2008) with Lillian Stewart Carl
- Future Americas (New York: DAW Books, 2008) with Martin H Greenberg
- Stalking the Wild Hare: Stories from the Gen Con Writer's Symposium (Kansasville, Wisconsin: Walkabout Publishing, 2010) with Chris Pierson, Jean Rabe and Marc Tassin
- Deathlands #96: Downrigger Drift (Toronto, Ontario: Gold Eagle Books, 2011) as by James Axler
- Deathlands #99: Perception Fault (Toronto, Ontario: Gold Eagle Books, 2011) as by James Axler
- How to Save the World (place not given: WMG Publishing/Fiction River, 2013)
- Deathlands #112: Dark Fathoms (Toronto, Ontario: Gold Eagle Books, 2013) as by James Axler
- Recycled Pulp (place not given: WMG Publishing/Fiction River, 2015)
- Chicks and Balances (New York: Baen Books, 2015) with Esther M Friesner
- Champions of Aetaltis (Dexter, Michigan: Mechanical Muse, 2016) with Marc Tassin