Essential Library of World War I: Trench Warfare
Essential Library of World War I: Medicine on the Battlefield
Essential Library of World War I: World War I Weapons
Military Technology: Top Secret Clearance: Warplanes of World War II Up Close
Defining Documents in American History: The 1900s (1900-1909)
Resisting the Holocaust: Upstanders, Partisans, and Survivors
World War II: The Definitive Encyclopedia and Document Collection
Frontline Families: World War I: Frontline Soldiers and Their Families
Essential Library of World War I: Women in World War I
World War I: The Essential Reference Guide
The Russian Revolution: The Fall of the Tsars and the Rise of Communism
Essential Library of World War I: World War I Battles
Essential Library of World War I: World War I Causes