1937
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Strasburger, Henryk. Sprawa Gdanska. Warsaw: Wydawnictwo Klubu Spoleczno-Politycznego, 1937.
Original Source Link: Pomorska Biblioteka Cyfrowa 
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Zalewski, Stanislaw. Abecadlo gdanskie. Warsaw: Liga Morska i Kolonialna, 1937.
Original Source Link: Bałtycka Biblioteka Cyfrowa
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1938
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Znaczenie Gdanska dla Polski. Poznan: Liga Morska i Kolonialna Okreg Poznanski, 1938?
Original Source Link: Wielkopolska Biblioteka Cyfrowa
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1939
The British War Blue Book, Miscellaneous No. 9 (1939). Documents Concerning German-Polish Relations and the Outbreak of Hostilities Between Great Britain and Germany on September 3, 1939. Presented by the Secretary of State for Foreign Affairs to Parliament by Command of His Majesty. London: Government of the United Kingdom, 1939. Web, Avalon Project.
The French Yellow Book. 1939. Web, Avalon Project.
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Markmann, Fritz. Danzig. Ed. Thies, Johann. Lipsk: Wilhelm Goldmann, 1939.
Original Source Link: Pomorska Biblioteka Cyfrowa
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Volkmann, Ernst. Danzig, die “Freie Stadt”. Ihre harmonisch gelösten und ihre unlösbaren Gegensätze. Berlin: Fischer. 1939.
Original Source Link: Pomorska Biblioteka Cyfrowa
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Post-1939
Lipski, Józef, and Wacław Jẹdrzejewicz. Diplomat in Berlin, 1933-1939; papers and memoirs of Józef Lipski, Ambassador of Poland. New York: Columbia University Press, 1968. Print. Available at Archive.org.