Classification
330 - Economics
4,399
610 - Medicine & health
1,560
700 - The arts; fine & decorative arts
706
658 - General management
598
600 - Technology
564
338 - Production
532
000 - Computer science, information & general works
507
300 - Social sciences
505
620 - Engineering & allied operations
474
333 - Economics of land & energy
462
363 - Other social problems & services
401
900 - History & geography
328
302 - Social interaction
242
380 - Commerce, communications & transportation
209
580 - Plants (Botany)
207
140 - Specific philosophical schools
200
570 - Life sciences; biology
197
500 - Natural sciences & mathematics
175
320 - Political science
152
331 - Labor economics
152
540 - Chemistry & allied sciences
134
576 - Genetics & evolution
124
551 - Geology, hydrology & meteorology
99
615 - Pharmacology & therapeutics
92
670 - Manufacturing
90
530 - Physics
88
340 - Law
80
304 - Factors affecting social behavior
73
100 - Philosophy & psychology
67
800 - Literature & rhetoric
66
414 - Phonology & phonetics
64
370 - Education
63
650 - Management & auxiliary services
63
612 - Human physiology
62
630 - Agriculture & related technologies
55
384 - Communications; telecommunication
54
158 - Applied psychology
48
628 - Sanitary & municipal engineering
48
153 - Mental processes & intelligence
41
581 - Specific topics in natural history
40
006 - Special computer methods
37
160 - Logic
37
541 - Physical chemistry
35
547 - Organic chemistry
34
778 - Fields & kinds of photography
34
621 - Applied physics
32
616 - Diseases
31
720 - Architecture
31
632 - Plant injuries, diseases & pests
29
791 - Public performances
29
more ...