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DOS Game: UFO - Enemy Unknown - YouTube
DOS Gamers - UFO: Enemy Unknown / X-COM: Terror from the Deep, DOS version from 1995 | Facebook
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/pic337862.jpg "X-COM: UFO Defense - Where to get it and how to play it | BoardGameGeek")
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OpenXCom renews the original UFO Defense as a valid option for terror | PC Gamer
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How Julian Gollop Created Influential Strategy Classic X-COM: UFO Defense | TechRaptor
