Classification
330 - Economics
620 - Engineering & allied operations
600 - Technology
396
658 - General management
351
900 - History & geography
251
333 - Economics of land & energy
250
700 - The arts; fine & decorative arts
209
363 - Other social problems & services
174
500 - Natural sciences & mathematics
174
000 - Computer science, information & general works
134
300 - Social sciences
96
380 - Commerce, communications & transportation
85
630 - Agriculture & related technologies
80
338 - Production
78
320 - Political science
70
384 - Communications; telecommunication
70
610 - Medicine & health
66
580 - Plants (Botany)
62
302 - Social interaction
61
331 - Labor economics
61
670 - Manufacturing
58
140 - Specific philosophical schools
51
370 - Education
44
551 - Geology, hydrology & meteorology
43
720 - Architecture
37
005 - Computer programming, programs & data
36
576 - Genetics & evolution
34
540 - Chemistry & allied sciences
28
745 - Decorative arts
27
340 - Law
25
381 - Commerce
24
581 - Specific topics in natural history
22
006 - Special computer methods
19
004 - Data processing & computer science
18
153 - Mental processes & intelligence
18
100 - Philosophy & psychology
17
332 - Financial economics
16
170 - Ethics
15
650 - Management & auxiliary services
15
800 - Literature & rhetoric
15
400 - Language
14
510 - Mathematics
14
001 - Knowledge
13
414 - Phonology & phonetics
13
158 - Applied psychology
12
304 - Factors affecting social behavior
12
780 - Music
8
301 - Sociology & anthropology
7
368 - Insurance
7
530 - Physics
7
more ...