"Historia de la Unión Soviética"

https://docs.wixstatic.com/ugd/ec84ca_b81ccc0c3c85437a97be9ac78b776c0f.pdf?fbclid=IwAR0l6VME_Thv0eUzsg1DlRr1IWMLUuYPPmrBHrYKEMmmhfActAh3TwaEX7A