history, such as the Silesian Uprisings and the Wielkopolska Uprising after the First World War. Near the end of his life he also became interested in the development of Polish political thought in the 19th and 20th centuries. In the 1970s, with the improving relations between Poles and Germans, he took part in the work of the Polish-German Textbook Commission, a joint Polish-German governmental organization which reviewed the current textbooks in both countries in order to remove anti-German and anti-Polish stereotypes and former propaganda. His last major work, Historia Polski 1914 – 1939 (History of Poland 1914-1939), was printed posthumously. Due to the government crackdown on opposition the book was heavily censored, but the underground errata was soon realised in the form of bibuła (Russian samizdat). The censorship of his books is a good example of the problem faced by historians under regimes which interfere with academic work. Specifically, the Polish communist censorship completely removed any mention of the Molotov-Ribbentrop Pact (Nazi Germany-Soviet alliance) and the section on the Soviet invasion of Poland on 17 September 1939 together with the photo of the German–Soviet military parade in Brest-Litovsk was removed and replaced with a general note on changed borders. Among his former students are three notable contemporary Polish historians: Marian Orzechowski, Adolf Juzwenko and Włodzimierz Suleja. Zieliński received the Knight's Cross of Polonia Restituta and the Medal of the National Education Commission. Selected bibliography "Liczba Polaków w Niemczech w latach 1918-1939 na tle systemu niemieckiej statystyki narodowościowej" (Number of Poles in Germany from 1918-1939 in the context of the German system of nationality statistics); in: "Przegląd Zachodni" z.9, (1948) "Polacy i polskość Ziemi Złotowskiej w latach 1918-1939" (Poles and Polish culture of Ziemia Złotowskia in 1918-1939) (1949) "Zagadnienie powstań śląskich" (The issue of Silesian Uprisings); in: "Wiadomości Historyczne" nr 5 (1952) i nr 1 (1953) "Położenie i walka górnośląskiego proletariatu w latach 1918–1922" (The situation and fights of the proletariat in the Upper Silesia from 1918-1922) (1957) Znaczenie traktatu wersalskiego dla rozwoju stosunków polsko-niemieckich"; in: "Kwartalnik Historyczny" nr 1 (The importantce of the Treaty of Versailles to the development of Polish-German relations), (1963) "Polska myśl polityczna a sprawa ziem zachodnich (przed rokiem 1914)" (Polish political thought and the issue of western lands (before the year 1914)) ; in: "Sobótka" nr 1-2 (1964) "Historia Polski 1864–1939" (History of Poland, 1864-1939) (1968) "Rola powstania wielkopolskiego oraz powstań śląskich w walce o zjednoczenie