 Complete the following phrase:  In November 1918, Volters traveled to Germany and Austria-Hungary to purchase Polish books for the Library of the Russian Academy of Sciences. Due to wartime chaos, he got stuck in Vilnius. Here he worked with Vaclovas Biržiška, Peoples Commissar of Education of the Lithuanian Soviet Socialist Republic, on establishing the Central Library of Lithuania considered to be the predecessor of the Martynas Mažvydas National Library of Lithuania. When the city was captured by Poland in the Vilna offensive during the 