Greyland: D.U.M.B.s (Deep Underground Military Bases) – Book 1
Is there a clandestine world of tunnels and bases underground? Who is living in them? What do they want with humanity? (Oyster link: https://www.oysterbooks.com/book/CNuohVeKA2YUDx4QY32yG3/greyland-dumbs-deep-underground-military-bases-book-1)
About the Book
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