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Subject
- Science fiction, American174
- Science fiction120
- Science fiction, English49
- Life on other planets42
- Life on other planets Fiction42
- Human-alien encounters23
- Human-alien encounters Fiction23
- Interplanetary voyages22
- Interplanetary voyages Fiction21
- Space and time18
- Space and time Fiction18
- Time travel18
- Time travel Fiction18
- Space warfare15
- Space warfare Fiction15
- Extraterrestrial beings14
- Extraterrestrial beings Fiction12
- Space colonies12
- Space colonies Fiction12
- Fantasy fiction10