Placement
- contained in Earth's Last Fortress / Lost in Spaceomnibus
- contained in Masters of Timecollection
- contained in Mercenaries of Tomorrowanthology
- contained in Science Fiction Special (16)omnibus
- contained in Science Fiction Special (26)omnibus
- contained in The Three Eyes of Evil and Earth's Last Fortresscollection
- contained in Time Troopersanthology
- contained in Transfinite: The Essential A. E. van Vogtcollection