Essential Library of World War I: World War I Weapons
Essential Library of World War I: Trench Warfare
Frontline Families: World War I: Frontline Soldiers and Their Families
Defining Documents in American History: The 1900s (1900-1909)
Tech in the Trenches: Strategic Inventions of World War I
Military Technology: Top Secret Clearance: Tanks of World War II Up Close
Essential Library of World War I: Harlem Hellfighters
Tech in the Trenches: Strategic Inventions of World War II
Auschwitz, Bergen-Belsen, Treblinka: The Holocaust Camps
The Attack on Pearl Harbor in United States History
Understanding the Holocaust: Hitler's Final Solution
Defining Documents in American History: Postwar 1940s (1945-1950)
Wars That Changed History: 50 of the World's Greatest Conflicts