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The article is published for information and it is a guide book about the resources the University of Rzeszów Research Centre on Polish Diaspora and Poles in the World. It should be useful for researchers interested in Polish diaspora issues in post-Soviet countries. The aim of the article is the presentation of archival materials connected with that issue. It is composed of two parts. The first part contains the characteristics of the University of Rzeszów archival materials. The second part presents projects which were carried out by the Research Centre on Polish Diaspora and Poles in the World and which are related to the Polish diaspora in post-Soviet countries.