Placement
- contained in Arthur C. Clarke Audiobook Collectionomnibus
- contained in Between Time and Terroranthology
- contained in Bruce Coville's Strange Worldsanthology
- contained in History Lessoncollection
- contained in More Than One Universe: The Collected Stories of Arthur C. Clarkecollection
- contained in Prelude to Marsomnibus
- contained in Reach for Tomorrowcollection
- contained in The Collected Stories of Arthur C. Clarkecollection
- contained in The Collected Stories: Volume Twocollection
- contained in The Nine Billion Names of Godcollection
- contained in To the Starsanthology