Number & letter	Sub heading
1 B - 7 D	General
25 A - 25 K	History of political thought
26 A - 26 FA	Ireland, Scotland & Wales
26 G - 26 Q	England: general
27 D - 27 F	England: ecclesiastical history
27 G - 28 E	England: Medieval
28 G - 29 D	England: 16th century
29 E - 30 J	England: 17th century
30 K - 31 M	Britain: 18th century
32 D - 35 A	Britain: 19th century
35 B - 35 Q	Britain: 20th century
35 R - 36 A	Britain: 21st century
37 A - 39 I	Britain: legal, constitutional and administrative
40 D - 44 H	Europe: general
45 A - 52 Z	European countries
53 CA - 58 J	Asia, Africa and Australasia
59 A - 59 M	North America (also see American History)
82 A - 82 Z 40	Economic and social history
83 A - 85 B	Europe: Ecclesiastical history
85 F	World history