The expansion of mandolin use continued after World War II through the late 1960s, and Japan still maintains a strong classical music tradition using mandolins, with active orchestras and university music programs. New orchestras were founded and new orchestral compositions composed. Japanese mandolin orchestras today may consist of up to 40 or 50 members, and can include woodwind, percussion, and brass sections. Japan also maintains an extensive collection of 20th Century mandolin music from Europe and one of the most complete collections of mandolin magazines from mandolin's golden age, purchased by Morishige Takei.
Japan hold and extensive collection of what? 
20th Century mandolin music from Europe and one of the most complete collections of mandolin magazines from mandolin's golden age