Placement
- Federation
- contained in Craig's Book / Edge of the Knifeomnibus
- contained in Empirecollection
- contained in Flight from Tomorrow and Other Science Fictioncollection
- contained in Sci-Fi Ultimate Collectionomnibus
- contained in Terro-Human Future History: Complete Seriesomnibus
- contained in The Essential H. Beam Piper Collectioncollection
- contained in The H. Beam Piper Megapackomnibus
- contained in The Rise of the Terran Federationanthology
- contained in The Time Travel Megapack: 26 Modern and Classic Science Fiction Storiesanthology