Why did the socialist system collapse in Central and Eastern European countries

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• Polish eastern provinces tr by J Sapieha /
  gan: Wielhorski W.
  Cyhoeddwyd: (1945)
• Country at school /
  gan: Nagy Erno Bajor
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• Czechoslovakia statistical abstract
• Czechoslovakia
• Czechislovakia : Country of friends /
  Cyhoeddwyd: (1976)