Books: 3923
Published before 1900: 1611
Published in 1901-1917: 1007
Published in 1918-1940: 776
Published in 1941-1945: 50
Published in 1946-1990: 429
Published since 1991: 50
Periodicals: 89995
Published before 1900: 2185
Published in 1901-1917: 2789
Published in 1918-1940: 8900
Published in 1941-1945: 9324
Published in 1946-1990: 58524
Published since 1991: 8181