According to the Locus Index, first appeared in ''Unusual Stories'' in May 1935 and was revised for the appearance in ''Rainbow Fantasia: 35 Spectrumatic Tales of Wonder'' (2001).
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| September 1974 |
|
Perry Rhodan #53: Spybot! | Ace Books | MAGAZINE | 142 |
| August 2001 |
|
Rainbow Fantasia; 35 Spectrumatic Tales of Wonder | Sense of Wonder Press | Anthology | 555 |