The Gospel of Thomas was recovered around 1945 from Nag Hammadi (Chenoboskion) near the Nile River.
(The Origin of the Bible: Newly Updated by F. F. Bruce, J. I. Packer, Philip W. Comfort, and Carl F. H. Henry, 2020. Old Testament and New Testament Apocrypha by R. K. Harrison, Page 91.)
The Gnostic New Testament apocryphal books found at Nag Hammadi include the purported teachings of Christ and "secret" instructions compiled by Gnostic writers and a few apocryphal compositions.
(The Origin of the Bible: Newly Updated by F. F. Bruce, J. I. Packer, Philip W. Comfort, and Carl F. H. Henry, 2020. Old Testament and New Testament Apocrypha by R. K. Harrison, Page 89-93.)