Books: 3920
Published before 1900: 1610
Published in 1901-1917: 1006
Published in 1918-1940: 778
Published in 1941-1945: 50
Published in 1946-1990: 426
Published since 1991: 50
Periodicals: 89469
Published before 1900: 2183
Published in 1901-1917: 2766
Published in 1918-1940: 8890
Published in 1941-1945: 9324
Published in 1946-1990: 58035
Published since 1991: 8180