Books: 3914
Published before 1900: 1610
Published in 1901-1917: 1006
Published in 1918-1940: 778
Published in 1941-1945: 50
Published in 1946-1990: 420
Published since 1991: 50
Periodicals: 86968
Published before 1900: 2183
Published in 1901-1917: 2742
Published in 1918-1940: 8636
Published in 1941-1945: 9324
Published in 1946-1990: 55904
Published since 1991: 8116