Middle east
Lost Secrets of the Sacred Ark: Amazing Revelations of the Incredible Power of Gold by Laurence Gardner
Megalithic
Atlantis of the West: The Case For Britain's Drowned Megalithic Civilization by Paul Dunbavin
Age of Enlightenment
The Empire of Reason: How Europe Imagined and America Realized the Enlightenment by Henry Steele Commager
American politics
The Right Nation: Why America is Different by John Micklethwait and Adrian Wooldridge
WWI
The myth of the great war :a new military history of world war one by John Mosier (How the Germans won the battles and how the Americans saved the Allies)
WWII
A Low Dishonest Decade: The Great Powers, Eastern Europe, and the Economic Origins of World War II, 1930-1941 by Paul N. Hehn
The Luftwaffe : Strategy for Defeat by Williamson Murray
The Last Year of the Luftwaffe, May1944 to May 1945, by Alfred Price
This Is Berlin: Radio Broadcasts from Nazi Germany by "William Shirer"
Hitler's Greatest Defeat: The Collapse of Army Group Centre, June 1944 By Paul Adair
Hitler's Espionage Machine: The True Story Behind One of the World's Most Ruthless Spy Networks by Christer Jorgensen
very good site about the u-boat war
http://www.uboat.net/
David Irving is one of the most controversial authors of history books.
He is one of the few English speaking historians and can read and speak German and was able to read original source documents in German and interview witness in German.
David Irving books
Download for free or buy
http://www.fpp.co.uk/books/index.html
Vietnam war
The Linebacker Raids: The Bombing Of North Vietnam, 1972 by John Smith