I am looking for direct REH references to Hyperborea; I have seen a lot of references to Conan being "captured by Hyperboreans" (including in the Dark Horse comic), but none of it appears to be in tales actually written by Howard. The only mention I've found so far is in "The Hyborean Age". I -have- found a reference to "Legions of the Dead" but that was deCamp/Carter IIRC.