Classification
600 - Technology
620 - Engineering & allied operations
900 - History & geography
1,798
700 - The arts; fine & decorative arts
1,051
333 - Economics of land & energy
873
363 - Other social problems & services
660
000 - Computer science, information & general works
449
330 - Economics
379
380 - Commerce, communications & transportation
367
630 - Agriculture & related technologies
324
610 - Medicine & health
307
580 - Plants (Botany)
266
140 - Specific philosophical schools
181
576 - Genetics & evolution
153
500 - Natural sciences & mathematics
139
551 - Geology, hydrology & meteorology
138
320 - Political science
122
540 - Chemistry & allied sciences
117
720 - Architecture
101
340 - Law
89
414 - Phonology & phonetics
83
370 - Education
81
658 - General management
69
581 - Specific topics in natural history
63
300 - Social sciences
62
800 - Literature & rhetoric
62
530 - Physics
56
100 - Philosophy & psychology
43
400 - Language
42
304 - Factors affecting social behavior
34
629 - Other branches of engineering
34
170 - Ethics
24
410 - Linguistics
21
612 - Human physiology
14
780 - Music
14
361 - Social problems & social welfare in general
13
301 - Sociology & anthropology
12
005 - Computer programming, programs & data
11
770 - Photography, photographs & computer art
11
657 - Accounting
10
745 - Decorative arts
10
550 - Earth sciences
9
200 - Religion
8
621 - Applied physics
8
338 - Production
7
331 - Labor economics
6
364 - Criminology
5
381 - Commerce
5
590 - Animals (Zoology)
5
615 - Pharmacology & therapeutics
5
more ...