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Doing a little digging, there actually was an entire Empire trilogy for the Apple II: World Builders, Interstellar Sharks, and Armageddon. While I can actually find quite a bit for expansion of World Builders, I'm not sure if there's enough for articles on the others. --tronvillain (talk) 14:28, 21 November 2018 (UTC)[reply]
Still more to add for World Builders, but I think I've scraped together enough to support the sequels as well. It's a pity Armageddon appears to exist essentially nowhere. --tronvillain (talk) 15:35, 24 November 2018 (UTC)[reply]