• 8 Books

• 2 Extraterrestrial beings
• 2 Human-alien encounters
• 2 Martians
• 2 Military government
• 2 Soldiers
• 1 Genetic engineering
• 1 Hugo Award
• 1 Science fiction
• 1 Science fiction, American
• 1 Scientists
• 1 Space flight to the moon
• 1 Teenage boys
• 1 Time travel
• 1 Traffic accident victims
• 1 Twenty-first century
• 1 Women

• 1 Gaiman, Neil
• 1 Geary, Clifford N.
• 1 Kulev, Stefan
• 1 Voter, Thomas W.

• 6 English
• 1 Bulgarian
• 1 Russian

• 1 Mars (Planet)

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