Classification
600 - Technology
620 - Engineering & allied operations
900 - History & geography
1,696
700 - The arts; fine & decorative arts
1,076
333 - Economics of land & energy
894
363 - Other social problems & services
676
000 - Computer science, information & general works
463
330 - Economics
385
630 - Agriculture & related technologies
375
380 - Commerce, communications & transportation
364
610 - Medicine & health
315
580 - Plants (Botany)
277
540 - Chemistry & allied sciences
184
140 - Specific philosophical schools
183
500 - Natural sciences & mathematics
156
576 - Genetics & evolution
155
551 - Geology, hydrology & meteorology
146
320 - Political science
129
720 - Architecture
100
414 - Phonology & phonetics
92
340 - Law
91
370 - Education
82
300 - Social sciences
71
581 - Specific topics in natural history
71
658 - General management
66
800 - Literature & rhetoric
58
530 - Physics
57
400 - Language
45
100 - Philosophy & psychology
44
629 - Other branches of engineering
34
304 - Factors affecting social behavior
33
170 - Ethics
27
410 - Linguistics
19
301 - Sociology & anthropology
17
612 - Human physiology
14
361 - Social problems & social welfare in general
13
780 - Music
13
005 - Computer programming, programs & data
11
200 - Religion
10
657 - Accounting
10
770 - Photography, photographs & computer art
10
550 - Earth sciences
9
621 - Applied physics
8
338 - Production
7
745 - Decorative arts
7
331 - Labor economics
6
364 - Criminology
5
590 - Animals (Zoology)
5
615 - Pharmacology & therapeutics
5
120 - Epistemology, causation & humankind
4
more ...