According to the United Nations, the countries of Eastern Europe include: Belarus, Bulgaria, Czech Republic, Hungary, Moldova, Poland, Romania, Russia, Slovakia and Ukraine.
Cold War International History Project The Cold War International History Project, established in 1991, supports the full and prompt release of historical materials by governments on all sides of the Cold War.
Making the History of 1989 Collection of translated primary documents, essays and teacher guides dealing with the fall of communism
Marxists.org The Marxists Internet Archive (MIA) is an all-volunteer, non-profit public library, established in its present form in 1998. MIA contains the writings of around 850 authors representing a complete spectrum of political, philosophical, and scientific thought, generally spanning the past 200 years. MIA contains these writings in 80 different languages, comprising a total size of over 180,000 documents and 288 GB of data.