Placement
- Federation
- contained in Sci-Fi Ultimate Collectionomnibus
- contained in Space Science Fiction Super Packanthology
- contained in Terro-Human Future History: Complete Seriesomnibus
- contained in The Essential H. Beam Piper Collectioncollection
- contained in The Federation Seriesomnibus
- contained in The H. Beam Piper Megapackomnibus