Reddit reviews Netheril: Empire of Magic (Advanced Dungeons & Dragons / Forgotten Realms)
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If you're interested in the Netheril Empire, there is a AD&D Supplement called "Netheril: Empire of Magic". (link just to show the product, I'm not suggesting paying 150 bucks for this)
I'm not sure where one would be able to get it legally for a more appropriate price, but I'm sure that you could be able to get your hands on a pdf.