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22. Archiw Akt Nowych. MSZ. Sygn. 6629 (in Polish).
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24. Materski W. Druga Rzeczpospolita wobec problem stosunków dyplomatycznych z Białorusiąi [Second Polish Republic in respect of the issue of diplomatic relations with Bielarus]. Stosunki polsko-białoruskie: historia i współczesność [Polish-Belarusian relations: history and modernity]. Kraków, Wydawnictwo AVALON, 2013, pp. 91-108. (in Polish).