Classification
330 - Economics
379
320 - Political science
248
370 - Education
178
333 - Economics of land & energy
163
304 - Factors affecting social behavior
153
610 - Medicine & health
145
004 - Data processing & computer science
100
363 - Other social problems & services
77
900 - History & geography
68
005 - Computer programming, programs & data
67
600 - Technology
60
300 - Social sciences
52
577 - Ecology
50
380 - Commerce, communications & transportation
48
658 - General management
46
306 - Culture & institutions
45
700 - The arts; fine & decorative arts
43
336 - Public finance
41
006 - Special computer methods
40
301 - Sociology & anthropology
40
338 - Production
40
551 - Geology, hydrology & meteorology
34
620 - Engineering & allied operations
34
616 - Diseases
33
340 - Law
30
400 - Language
27
621 - Applied physics
27
634 - Orchards, fruits & forestry
27
371 - Schools & their activities; special education
26
410 - Linguistics
26
630 - Agriculture & related technologies
25
361 - Social problems & social welfare in general
24
800 - Literature & rhetoric
23
305 - Social groups
20
100 - Philosophy & psychology
19
650 - Management & auxiliary services
19
910 - Geography & travel
19
000 - Computer science, information & general works
18
200 - Religion
17
303 - Social processes
17
530 - Physics
16
550 - Earth sciences
15
327 - International relations
14
331 - Labor economics
14
510 - Mathematics
14
332 - Financial economics
13
378 - Higher education
13
580 - Plants (Botany)
13
364 - Criminology
12
418 - Standard usage & applied linguistics
12
more ...