The following was submitted by Chuck Z, following a thread on Elder Gods:

• >[...] according to CAS Ubbo Sathla guards the Elder Tablets in a cavern beneath Antarctica.

  >What story? There is no reference to either a cavern or Antarctica in Smith's story "Ubbo-Sathla" (Weird Tales, July 1933).

  I think (?) it's in the story "Arctic Stone" by Ross ? Bagby (Eldritch Tales 7, 1980) : did have a copy somewhere...

TJS replied:

• >From Chris Jarocha-Ernst's bibliography:

  28. Ross F. Bagby, "The Arctic Stone", Eldritch Tales, No. 7, June 1980.
  Mentions Cthulhu; Dagon; Daoth-Yhol.

  Probably a Lin Carter interpolation.

• According to http://www.eerie.fr/~alquier/HPL/azif....

  "Ubbo-Sathla, ye source and ye end lay confined forever at ye subterranean place referred to only as "gray-litten Y'qaa," beneath ancient Hyperborea."

  -.. I don't know where he gets his source but the site is pretty good.

  According to http://www.oceanstar.com/cas/cjetext.htm....

  Ubbo-Sathla shows up, in addition to the title story, in "The Descent Into the Abyss," by Clark Ashton Smith and Lin Carter; also "The Unbegotten Source" by Lin Carter; and "Papyrus of the Dark Wisdom," by Clark Ashton Smith and Lin Carter. There may be more cross-references there.

Chaz Engan added:

• Other places Ubbo has appeared are ...

  August Derleth's books --
  

  • "The House on Curwen Street" in the _Trail of Cthulhu_, p.21
  • "The Keeper of the Key" in the _Trail of Cthulhu_, p. 151
  • "The Lurker At the Threshold" in the _Watchers Out of Time_, p. 133

  All of these from The Cthulhu Mythos Guide:
  http://members.home.net/cmythos/mythos.htm

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