MUD Game Programming. Not sure how easy obtaining a copy would be in 2023 but it has two projects which I recall being a lot of fun. I never did build a successful MUD but did learn a fair amount about network programming. https://www.goodreads.com/en/book/show/927128.Mud_Game_Progr... (https://www.goodreads.com/en/book/show/927128.Mud_Game_Programming_With_CDROM_)
MUD Game Programming
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