No particular organisation, I just went through Goodreads and picked out my favourites from my read list.

Tommy: The British Soldier on the Western Front 1914-1918 by Richard Holmes

The Wages of Destruction: The Making and Breaking of the Nazi Economy by Adam Tooze (not the easiest read, lots of economic termoninolgy and statistics)

The Coming of the Third Reich (The History of the Third Reich, #1) Richard Evans

Peter the Great: His Life and World by Robert K. Massie

The White War: Life and Death on the Italian Front 1915 - 1919 by Mark Thompson

The Time Traveller's Guide to Medieval England: A Handbook for Visitors to the Fourteenth Century by Ian Mortimer

The Crusades: The War for the Holy Land by Thomas Asbridge

Afgantsy: The Russians In Afghanistan, 1979-1989 by Rodric Braithwaite

Savage Continent: Europe in the Aftermath of World War II by Keith Lowe

The War That Ended Peace: The Road to 1914 by Margaret MacMillan

The German War: A Nation Under Arms by Nicholas Stargardt (WWII)

A Spy Among Friends: Kim Philby and the Great Betrayal by Ben Macintyre

Ring of Steel: Germany and Austria-Hungary in World War I by Alexander Watson

July Crisis: The World's Descent into War, Summer 1914 by T.G Otte (advanced, little background context provided and pretty much 500 pages from the assassination of Franz Ferdinand to just before Britain declares war in early August)

The Vanquished: Why the First World War Failed to End, 1917-1923 by Robert Gerwarth

The Fortress: The Great Siege of Przemysl by Alexander Watson

Statesman of Europe: A Life of Sir Edward Grey by T.G Otte (probably need a bit of knowledge of the late Victorian and Edwardian domestic and international politics though)

The Northumbrians: North-East England and its People - A New History by Dan Jackson

Blood and Iron: The Rise and Fall of the German Empire 1871–1918 by Katja Hoyer