Book 1
Greyland: D.U.M.B.s (Deep Underground Military Bases) - Book 1
David Sloma
Book 2
Oceandeep: D.U.M.B.s (Deep Underground Military Bases) - Book 2
David Sloma
Book 3
Rescueplan: D.U.M.B.s (Deep Underground Military Bases) - Book 3
David Sloma
Book 4
Moonbase: D.U.M.B.s (Deep Underground Military Bases) – Book 4
David Sloma
Book 5
Wormwood: D.U.M.B.s (Deep Underground Military Bases) - Book 5
David Sloma
Book 6
Destroyer: D.U.M.B.s (Deep Underground Military Bases) - Book 6
David Sloma
Book 7
Purifier: D.U.M.B.s (Deep Underground Military Bases) - Book 7
David Sloma