Essential Library of World War I: World War I Causes
World War II: The Definitive Encyclopedia and Document Collection
Essential Library of World War I: World War I Leaders
Essential Library of World War I: Harlem Hellfighters
Essential Library of World War I: World War I Aftermath
World War I: The Essential Reference Guide
Essential Library of World War I: Medicine on the Battlefield
Military Technology: Top Secret Clearance: Tanks of World War II Up Close
Understanding the Holocaust: Nazi War Criminals
Cause & Effect in History: World War II
Dictatorship, Fascism, and Totalitarianism
Hitler, Goebbels, Himmler: The Nazi Holocaust Masterminds
Understanding the Holocaust: Holocaust Survivors