Jankowski and, later, Stefan Mateja ) and a Department for Elimination of the Effects. 24 The looting was supervised by experts of the SS - Ahnenerbe, Einsatzgruppen units, who were responsible for art, and by experts of Haupttreuhandstelle Ost, who were responsible for more mundane objects. 54 Censorship at first targeted books that were considered to be "serious including scientific and educational texts and texts that were thought to promote Polish patriotism; only fiction that was free of anti-German overtones was permitted. 10 The occupying powers destroyed Polish book collections, including the Sejm and Senate Library, the Przedziecki Estate Library, the Zamoyski Estate Library, the Central Military Library, and the Rapperswil Collection. 129 The resulting culture was, however, different from the culture of interwar Poland for a number of reasons. Old textbooks were confiscated and school libraries were closed. Many university professors, as well as teachers, lawyers, artists, writers, priests and other members of the Polish intelligentsia were arrested and executed, or transported to concentration camps, during operations such as AB-Aktion. Moreover, the Polish schools are closed during at least five months out of the ten months of the school year due to lack of coal or other fuel. 9 83 84 More than 90,000 secondary-school pupils attended underground classes held by nearly 6,000 teachers between 19 in four districts of the General Government (centered on the cities of Warsaw, Kraków, Radom and Lublin ). Twenty-five museums and a host of other institutions were destroyed during the war. 150151 Madajczyk 1970,. . Le pseudo est : Le numero d'annonce est le suivant. Arkady Fiedler, based in Britain with the Polish Armed Forces in the West wrote about the 303 Polish Fighter Squadron. 128138 a b c d Bukowska, Ewa, (2003 Secret Teaching in Poland in the Years 1939 to 1945, London Branch of the Polish Home Army Ex-Servicemen's Association. Under such circumstances, the school day, which normally lasts five hours, is reduced to one hour. Wywiad z Ireną Andersową, żoną Generała Władysława Andersa, Cooltora, Retrieved on Murdoch 1990,. .