Classification
900 - History & geography
600 - Technology
602
620 - Engineering & allied operations
590
700 - The arts; fine & decorative arts
428
333 - Economics of land & energy
283
320 - Political science
150
000 - Computer science, information & general works
145
363 - Other social problems & services
138
330 - Economics
121
300 - Social sciences
117
380 - Commerce, communications & transportation
108
610 - Medicine & health
99
800 - Literature & rhetoric
97
576 - Genetics & evolution
81
580 - Plants (Botany)
62
100 - Philosophy & psychology
57
340 - Law
55
140 - Specific philosophical schools
54
400 - Language
52
720 - Architecture
52
410 - Linguistics
49
414 - Phonology & phonetics
44
200 - Religion
43
500 - Natural sciences & mathematics
39
370 - Education
37
551 - Geology, hydrology & meteorology
30
301 - Sociology & anthropology
29
530 - Physics
25
780 - Music
24
540 - Chemistry & allied sciences
23
304 - Factors affecting social behavior
20
581 - Specific topics in natural history
20
658 - General management
17
170 - Ethics
14
630 - Agriculture & related technologies
11
297 - Islam, Babism & Bahai Faith
9
770 - Photography, photographs & computer art
8
120 - Epistemology, causation & humankind
7
791 - Public performances
7
350 - Public administration & military science
6
398 - Folklore
6
612 - Human physiology
4
520 - Astronomy & allied sciences
3
364 - Criminology
2
650 - Management & auxiliary services
2
657 - Accounting
2
070 - News media, journalism & publishing
1
160 - Logic
1
226 - Gospels & Acts
1
296 - Judaism
1
more ...