Placement
- contained in Arthur C. Clarke Audiobook Collectionomnibus
- contained in From the Ocean, from the Starsomnibus
- contained in More Than One Universe: The Collected Stories of Arthur C. Clarkecollection
- contained in Skylife: Space Habitats in Story and Scienceanthology
- contained in The Other Side of the Skycollection
- contained in Time Probe: The Sciences in Science Fictionanthology