Steven Pinker’s new book ‘The Better Angels of our Nature: the Decline of Violence in History and Its Causes ‘ relies heavily on statistics from the following source:
The Correlates of War Project at: http://www.correlatesofwar.org/
And Matthew White founder of the science of Atrocitology is also heavily used: see
This is Matthew’s map of what he calls the Hemoclysm or ‘blood catastrophe’ of the 20th century’s 150-180 million war and mass murder deaths:
There is also a great interview with Steven Pinker about his book at:
I will be posting some of his tables about war in the next few weeks: I don’t want to overwhelm you, but this is the mother lode for future conflict work.