Classification
363 - Other social problems & services
4,208
330 - Economics
2,785
333 - Economics of land & energy
2,089
320 - Political science
622
700 - The arts; fine & decorative arts
523
600 - Technology
450
551 - Geology, hydrology & meteorology
417
610 - Medicine & health
417
630 - Agriculture & related technologies
381
380 - Commerce, communications & transportation
369
000 - Computer science, information & general works
314
620 - Engineering & allied operations
307
304 - Factors affecting social behavior
301
900 - History & geography
283
140 - Specific philosophical schools
205
300 - Social sciences
168
500 - Natural sciences & mathematics
163
581 - Specific topics in natural history
162
370 - Education
157
577 - Ecology
153
658 - General management
138
910 - Geography & travel
137
331 - Labor economics
129
580 - Plants (Botany)
129
550 - Earth sciences
109
621 - Applied physics
108
576 - Genetics & evolution
100
340 - Law
97
720 - Architecture
83
100 - Philosophy & psychology
76
336 - Public finance
73
540 - Chemistry & allied sciences
71
570 - Life sciences; biology
70
338 - Production
57
301 - Sociology & anthropology
55
302 - Social interaction
50
628 - Sanitary & municipal engineering
49
170 - Ethics
46
800 - Literature & rhetoric
46
414 - Phonology & phonetics
42
200 - Religion
38
400 - Language
36
624 - Civil engineering
36
660 - Chemical engineering
36
530 - Physics
34
634 - Orchards, fruits & forestry
28
612 - Human physiology
27
631 - Techniques, equipment & materials
27
307 - Communities
26
572 - Biochemistry
21
more ...