They are mentioned in many of Lovecraft's stories, including At the Mountains of Madness (1936), The Dream-Quest of Unknown Kadath (1926), "The Other Gods" (1933), and The Shadow Out of Time (1936).
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The Pnakotic Manuscripts appear in both "The Collect Call of Cathulhu" (an episode from The Real Ghostbusters), and in the computer game Call of Cthulhu: Dark Corners of the Earth as the Pnakotica.
Irish Manuscripts Commission | Royal Commission on Historical Manuscripts | Georgian National Center of Manuscripts | Welsh Manuscripts Society | Stowe manuscripts | Masonic manuscripts | Lansdowne manuscripts | Interpolation (manuscripts) | Freising manuscripts | English Apocalypse manuscripts | Arundel Manuscripts | Arundel manuscripts |