DARK AS THE DUNGEON should be DARK AS A DUNGEON.

allmusic lists 98 recordings called DARK AS A DUNGEON (including those by Merle Travis) and only 2 called DARK AS THE DUNGEON, both by Johnny Cash. (But even Johnny Cash is inconsistent; he has also recorded it as DARK AS A DUNGEON.)

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I have the song on two Marle Travis CD's "Dark as A Dungeon" on both of them.
-Joe Offer-