​PKU library is one of the earliest libraries in China that collects newspapers and periodicals. There are more than 10,000 kinds of periodicals and more than 600 kinds of newspapers published during the Late Qing Dynasty and the Republican Period, and over 50,000 copies of books published in the Republican period are collected in PKU library. With one of the largest collection in China, the PKU library also obtains different kinds of only existing copy and rare editions, which is cherished by many collectors and scholars. These collections are mainly composed of the books once obtained by the old Peking University and Yenching University, and some books from l'Université Franco-Chinoise and Deutschland-Institut. The newspapers and books published during the Late Qing Dynasty and the Republican Period are of much importance to the studies on the modernization of China, including the aspects of ideological and academic, military and politics, education and culture, language and literature, social customs as well.