Books: 3874
Published before 1900: 1610
Published in 1901-1917: 1006
Published in 1918-1940: 778
Published in 1941-1945: 50
Published in 1946-1990: 380
Published since 1991: 50
Periodicals: 72087
Published before 1900: 2182
Published in 1901-1917: 2519
Published in 1918-1940: 7393
Published in 1941-1945: 8071
Published in 1946-1990: 43943
Published since 1991: 7919