The Avalon Project at Yale University - a collection of primary 20th Century documents.

The Modern History Sourcebook - a collection of primary 20th Century documents.

Trenches on the Web - various World War One information.

World War One - visual and textual information describing the causes of the war and how the war unfolded.

Soviet Posters - a social history website with propaganda posters of Stalin.

Cold War International History Project @ the Woodrow Wilson International Center for Scholars - various Cold War documents and information.

Soviet Archives Exhibit - great Soviet History information.

Nazi Propaganda - this site contains a wide selection of written and pictorial sources on Nazi Germany.