Section: Invasion of Poland

PHOTOS: World War II Erupts: Color Photos From the Invasion of Poland, 1939, LIFE.com

VIDEO: What is the Holocaust? (4/7): War and Territorial Expansion (1:33), Yad Vashem, Holocaust Education Video Toolbox

SURVIVOR TESTIMONY: Henia Bryer, Prisoner Number A26188 (43:22), Timeline Documentary

SURVIVOR TESTIMONY: Mala Tribich (22:51), TEDxCourtauldInstitute

SURVIVOR TESTIMONY: A Survivor’s Journey, The Life of Roman Kent (10:54), Jewish Foundation for the Righteous

VIDEO: One Survivor Remembers (39:04), USHMM

SURVIVOR TESTIMONY: Politische Pole-Jude, The Story of Pinchas Gutter (1:10:08), Hebrew University/YouTube

The Eastern Front: Photographs as Propaganda, Yad Vashem

The Holocaust-Economic Exploitation, Holocaust Education and Archive Research Team

Jews in Nazi-Occupied Countries: Poland, Jewish Virtual Library