Placement
- contained in Best SF: 1967anthology
- contained in Decade: The 1960santhology
- contained in Hawksbill Times Twoomnibus
- contained in Press Enter ▮ / Hawksbill Stationanthology
- contained in The Best of Robert Silverbergcollection
- contained in The Best Time Travel Stories of All Timeanthology
- contained in The Reality Trip and Other Implausibilitiescollection
- contained in Time and Time Againcollection
- contained in To the Dark Star: 1962-69collection
- contained in World's Best Science Fiction: 1968anthology