Archival inquiries have always been the basis of every historian's work. Researching the past is not possible without analyzing the sources, and these – although they often relate to one event – are often scattered across many archival institutions. The purpose of this article is to analyze all kinds of archival materials stored at the Józef Piłsudski Institute in New York, which relate to the history of the Polish-Russian war of 1919-1920. Although 100 years have passed since those events, there are still some ambiguities in Polish historiography about this conflict that require clarification or at least clarification. The materials stored at the Pilsudski Institute in New York were for many years the least used and least released into the scientific circulation for many years. Perhaps this text will reverse this trend, which will certainly benefit the quality of research.
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