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Subject
- Science fiction264
- Science fiction, American250
- History and criticism153
- Life on other planets83
- Science fiction, English73
- Interplanetary voyages46
- Criticism and interpretation41
- Human-alien encounters41
- Authorship34
- Time travel31
- Science30
- Authors, American29
- Delany, Samuel R.25
- American fiction24
- History23
- Extraterrestrial beings21
- Fantasy fiction, American21
- Language and languages20
- Regression (Civilization)20
- Space warfare19