Essential Library of World War I: Trench Warfare
Military Technology: Top Secret Clearance: Tanks of World War II Up Close
Essential Library of World War I: Medicine on the Battlefield
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
Tech in the Trenches: Strategic Inventions of World War II
The Russian Revolution: The Fall of the Tsars and the Rise of Communism
Essential Library of World War I: World War I Causes
Primary Sources in U.S. History: World War II
Essential Library of World War I: World War I Leaders
Essential Library of World War I: Women in World War I
World War I: The Essential Reference Guide