• 3 College Library

• 5 Space warfare
• 4 Combat
• 4 Shooting
• 3 Battles
• 3 Human-alien encounters
• 2 Extraterrestrial beings
• 2 Science fiction
• 2 Survival
• 2 World War, 1939-1945
• 1 Heroes
• 1 Imaginary wars and battles
• 1 Interplanetary voyages
• 1 Military art and science
• 1 Pillage
• 1 Quests (Expeditions)
• 1 Robotic exoskeletons
• 1 Robots
• 1 Space colonies
• 1 Star Wars films

• 2 Motive Studio
• 1 BioWare Corp.
• 1 Final Strike Games (Firm)
• 1 Respawn Entertainment
• 1 Sony Computer Entertainment

• 8 English
• 1 French

• 2 Outer space

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