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Subject
- Science fiction, American191
- Science fiction155
- Science fiction, English53
- Life on other planets33
- Life on other planets Fiction33
- Interplanetary voyages25
- Interplanetary voyages Fiction22
- Time travel Fiction19
- Time travel18
- Extraterrestrial beings15
- Human-alien encounters15
- Fantasy fiction, American14
- Human-alien encounters Fiction14
- Extraterrestrial beings Fiction13
- Quests (Expeditions)12
- Quests (Expeditions) Fiction12
- Space and time12
- Space and time Fiction12
- Fantasy fiction11
- Space colonies11