Classification
700 - The arts; fine & decorative arts
619
600 - Technology
516
620 - Engineering & allied operations
404
000 - Computer science, information & general works
392
900 - History & geography
343
500 - Natural sciences & mathematics
319
333 - Economics of land & energy
307
006 - Special computer methods
250
331 - Labor economics
240
610 - Medicine & health
195
380 - Commerce, communications & transportation
140
363 - Other social problems & services
137
330 - Economics
122
140 - Specific philosophical schools
110
576 - Genetics & evolution
102
580 - Plants (Botany)
94
720 - Architecture
58
530 - Physics
56
551 - Geology, hydrology & meteorology
56
630 - Agriculture & related technologies
56
519 - Probabilities & applied mathematics
50
612 - Human physiology
50
658 - General management
49
400 - Language
48
320 - Political science
42
340 - Law
41
005 - Computer programming, programs & data
34
540 - Chemistry & allied sciences
33
370 - Education
32
800 - Literature & rhetoric
31
414 - Phonology & phonetics
28
621 - Applied physics
16
300 - Social sciences
15
153 - Mental processes & intelligence
12
410 - Linguistics
12
629 - Other branches of engineering
12
003 - Systems
11
570 - Life sciences; biology
11
581 - Specific topics in natural history
11
100 - Philosophy & psychology
8
550 - Earth sciences
8
615 - Pharmacology & therapeutics
8
004 - Data processing & computer science
7
515 - Analysis
7
770 - Photography, photographs & computer art
7
780 - Music
7
170 - Ethics
6
304 - Factors affecting social behavior
6
510 - Mathematics
6
745 - Decorative arts
6
more ...