Classification
330 - Economics
320 - Political science
388
100 - Philosophy & psychology
247
658 - General management
178
300 - Social sciences
166
333 - Economics of land & energy
156
700 - The arts; fine & decorative arts
127
900 - History & geography
122
500 - Natural sciences & mathematics
116
600 - Technology
114
380 - Commerce, communications & transportation
100
000 - Computer science, information & general works
99
363 - Other social problems & services
91
620 - Engineering & allied operations
83
340 - Law
75
140 - Specific philosophical schools
68
610 - Medicine & health
61
370 - Education
51
004 - Data processing & computer science
47
576 - Genetics & evolution
42
338 - Production
41
331 - Labor economics
37
170 - Ethics
36
361 - Social problems & social welfare in general
36
302 - Social interaction
31
384 - Communications; telecommunication
31
551 - Geology, hydrology & meteorology
31
650 - Management & auxiliary services
27
800 - Literature & rhetoric
25
301 - Sociology & anthropology
24
720 - Architecture
24
670 - Manufacturing
22
200 - Religion
21
304 - Factors affecting social behavior
20
332 - Financial economics
19
336 - Public finance
19
153 - Mental processes & intelligence
17
350 - Public administration & military science
16
410 - Linguistics
15
745 - Decorative arts
15
780 - Music
14
381 - Commerce
13
400 - Language
13
510 - Mathematics
13
657 - Accounting
13
580 - Plants (Botany)
12
581 - Specific topics in natural history
11
630 - Agriculture & related technologies
10
006 - Special computer methods
9
005 - Computer programming, programs & data
8
more ...