Books: 3881
Published before 1900: 1610
Published in 1901-1917: 1006
Published in 1918-1940: 778
Published in 1941-1945: 50
Published in 1946-1990: 387
Published since 1991: 50
Periodicals: 75640
Published before 1900: 2183
Published in 1901-1917: 2601
Published in 1918-1940: 7421
Published in 1941-1945: 8071
Published in 1946-1990: 47350
Published since 1991: 7954