Books: 3904
Published before 1900: 1610
Published in 1901-1917: 1006
Published in 1918-1940: 778
Published in 1941-1945: 50
Published in 1946-1990: 410
Published since 1991: 50
Periodicals: 84651
Published before 1900: 2183
Published in 1901-1917: 2714
Published in 1918-1940: 8482
Published in 1941-1945: 8269
Published in 1946-1990: 54824
Published since 1991: 8116