Classification
576 - Genetics & evolution
900 - History & geography
320 - Political science
1,361
330 - Economics
1,331
300 - Social sciences
461
340 - Law
209
700 - The arts; fine & decorative arts
147
600 - Technology
131
620 - Engineering & allied operations
124
333 - Economics of land & energy
79
000 - Computer science, information & general works
51
363 - Other social problems & services
46
380 - Commerce, communications & transportation
43
100 - Philosophy & psychology
42
140 - Specific philosophical schools
35
370 - Education
33
200 - Religion
32
800 - Literature & rhetoric
27
610 - Medicine & health
25
580 - Plants (Botany)
23
400 - Language
18
500 - Natural sciences & mathematics
18
301 - Sociology & anthropology
16
414 - Phonology & phonetics
16
720 - Architecture
16
304 - Factors affecting social behavior
15
581 - Specific topics in natural history
12
630 - Agriculture & related technologies
11
410 - Linguistics
10
530 - Physics
9
551 - Geology, hydrology & meteorology
9
658 - General management
8
780 - Music
7
943 - Central Europe; Germany
7
170 - Ethics
6
540 - Chemistry & allied sciences
6
297 - Islam, Babism & Bahai Faith
5
770 - Photography, photographs & computer art
4
361 - Social problems & social welfare in general
3
296 - Judaism
2
364 - Criminology
2
650 - Management & auxiliary services
2
791 - Public performances
2
920 - Biography, genealogy & insignia
2
940 - History of Europe
2
947 - Eastern Europe; Russia
2
016 - Bibliographies of works on specific subjects
1
120 - Epistemology, causation & humankind
1
231 - God
1
270 - History of Christianity & Christian church
1
more ...