Title: Greyland: D.U.M.B.s (Deep Underground Military Bases) - Book 1, Author: David Sloma
Title: Oceandeep: D.U.M.B.s (Deep Underground Military Bases) - Book 2, Author: David Sloma
Title: Rescueplan: D.U.M.B.s (Deep Underground Military Bases) - Book 3, Author: David Sloma
Title: Moonbase: D.U.M.B.s (Deep Underground Military Bases) - Book 4, Author: David Sloma
Title: Wormwood: D.U.M.B.s (Deep Underground Military Bases) - Book 5, Author: David Sloma
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Title: D.U.M.B.s (Deep Underground Military Bases) Ebook Boxed Set - All 4 novels, Author: David Sloma
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