There are lots of PaleoJudaica posts on the Coptic Gnostic library in the Nag Hammadi Codices. You can find some that supplement the essay above here, here, here, here, here, here, and here.
There are also many posts on the Gospel of Thomas. Some recent ones are here, here, here, here, here, and here.
Cross-file under Coptic Watch.
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