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