Classification
330 - Economics
111
900 - History & geography
76
300 - Social sciences
67
658 - General management
66
320 - Political science
53
333 - Economics of land & energy
47
500 - Natural sciences & mathematics
47
620 - Engineering & allied operations
45
370 - Education
44
200 - Religion
36
100 - Philosophy & psychology
35
700 - The arts; fine & decorative arts
32
140 - Specific philosophical schools
31
340 - Law
31
600 - Technology
27
332 - Financial economics
26
005 - Computer programming, programs & data
25
338 - Production
25
006 - Special computer methods
23
363 - Other social problems & services
23
400 - Language
22
621 - Applied physics
22
800 - Literature & rhetoric
22
301 - Sociology & anthropology
21
000 - Computer science, information & general works
20
331 - Labor economics
20
610 - Medicine & health
20
380 - Commerce, communications & transportation
18
302 - Social interaction
16
304 - Factors affecting social behavior
15
004 - Data processing & computer science
14
170 - Ethics
14
410 - Linguistics
14
025 - Library operations
12
670 - Manufacturing
11
720 - Architecture
11
384 - Communications; telecommunication
10
616 - Diseases
9
780 - Music
9
745 - Decorative arts
8
361 - Social problems & social welfare in general
7
368 - Insurance
7
510 - Mathematics
7
519 - Probabilities & applied mathematics
7
530 - Physics
7
581 - Specific topics in natural history
7
153 - Mental processes & intelligence
6
297 - Islam, Babism & Bahai Faith
6
364 - Criminology
6
371 - Schools & their activities; special education
6
more ...