I just uploaded the newest edition of Hell Holes: What Lurks Below to both CreateSpace (Amazon) and IngramSpark (used by libraries). Both have passed initial automatic validation and are waiting on final human validation, which will occur sometime in the next 24-48 hours. Once approved, the paperback version will be available again.
The Kindle and Smashword versions are now updated.
In the mean time, the book is available in paperback from CreateSpace.