Here below you can find all the books we know are available online (this does not include used books) and you can order them all through uboat.net.

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B
Baltic Assignment, Wilson, Michael, 1985,
British Merchant Ships Sunk by U-boats in the 1914-1918 War, Tennent, A. J., 1990,
British Vessels Lost at Sea 1914-18 and 1939-45, N/A, 1988,

C
The Commerce War, Taylor, Carl T., 1999,

D
Death in the Irish Sea, Stokes, Roy, 1998,
The Dover Patrol 1914-18, Humphreys, Roy, 1998,

F
Find and Destroy, Messimer, Dwight, 2001,
Fips - Legendary U-boat Commander, Brooks, Geoffrey, 2000,

G
German U-Boat Crews 1914-45, Williamson, Gordon, 1996,

J
Jutland 1916, London, Charles, 2000,

K
The K Boats, Everitt, Don, 1999,

L
The Land That Time Forgot, Burroughs, Edgar Rice, 1999,
The Lusitania, Butler, Daniel Allen, 2000,

M
The Merchant U-boat, Messimer, Dwight R., 1988,

Q
Q-Ships, Ritchie, Carson, 1985,

R
Raiders of the Deep, Thomas, Lowell, 1995, (translations)
Royal Naval Air Service 1912-1918, King, Bradley, 1997,
Rules of Encounter, Kennedy, William P., 1992, (translations)

S
A Sailor of Austria, Biggins, John, 1994,
Sea Killers in Disguise, Bridgland, Tony, 1999,
Slaughter at Sea, Coles, Alan, 1986,
Submarines and the War at Sea 1914-1918, Compton-Hall, Richard, 2000,

U
The U-Boat Offensive 1914-1945, Tarrant, V.E., 2000, (translations)
The U-Boat War, 1914-1918, Gray, Edwyn A., 1994,
U-Boats Destroyed, Grant, Robert M., 2002,
U-Boats Of World War I, Lydon, Kelly K., 1998,

V
Verschollen, Messimer, Dwight R., 2002,
Voyage of the Deutschland, König, Paul, 2000,

W
World War One - Marinekorps Flandern, Ryheul, Johan, 2002,
WW I - Marinekorps Flandern, Ryheul, Johan, 2002,

Z
The Zeebrugge and Ostend Raids 1918, Lake, Deborah, 2002,

Number of books available online is 31