Sci-FiHistoricalLiterary
Track this book
You choose which shelves are public. Progress and read dates stay yours.
About
Twins become involved in an experiment in time travel.
More by Robert Silverberg
All books
More like this
Reviews
Rating integrity
HealthyCounted ratings come from accounts older than 7 days and were made on or after publication. Finished readers weigh ×1.0. Readers who have not finished yet weigh ×0.5. Did-not-finish ratings are shown but not counted.
Editions
7 editions · 2 languages- Paperback · English · 1991Bantam · 9780552800013
- Hardcover · English · 1991Random House Value Publishing · 9780517070833
- Other · English · 1989Penguin Random House · 9780091737573
- Other · English · 1989Bantam Books · 210 pages · 9780553280012
- Other · English · 1987Walker · 200 pages · 9780802767127
- Other · EnglishBeaver · 9780099624608
Science fictionTwinsFictionJuvenile literaturePresidentsBiographyHistoryPaleontologists