Шифр
900 - History & geography
76
300 - Social sciences
51
600 - Technology (Applied sciences)
12
700 - The arts
11
200 - Religion
5
400 - Language
3
000 - Computer science, information, general works
2
100 - Philosophy & psychology
1
500 - Natural sciences and mathematics
1
800 - Literature (Belles-lettres) and rhetoric
1