Classification
380 - Commerce, communications & transportation
000 - Computer science, information & general works
523
700 - The arts; fine & decorative arts
222
333 - Economics of land & energy
196
330 - Economics
194
600 - Technology
185
363 - Other social problems & services
126
610 - Medicine & health
116
900 - History & geography
96
320 - Political science
94
140 - Specific philosophical schools
90
620 - Engineering & allied operations
90
658 - General management
75
580 - Plants (Botany)
63
370 - Education
58
551 - Geology, hydrology & meteorology
58
576 - Genetics & evolution
52
500 - Natural sciences & mathematics
48
384 - Communications; telecommunication
46
530 - Physics
41
300 - Social sciences
38
540 - Chemistry & allied sciences
35
340 - Law
33
400 - Language
32
630 - Agriculture & related technologies
31
414 - Phonology & phonetics
24
720 - Architecture
23
100 - Philosophy & psychology
22
800 - Literature & rhetoric
22
581 - Specific topics in natural history
20
410 - Linguistics
18
304 - Factors affecting social behavior
15
612 - Human physiology
14
170 - Ethics
12
808 - Rhetoric & collections of literature
11
301 - Sociology & anthropology
10
361 - Social problems & social welfare in general
9
791 - Public performances
9
302 - Social interaction
7
519 - Probabilities & applied mathematics
7
780 - Music
7
004 - Data processing & computer science
6
200 - Religion
6
338 - Production
6
550 - Earth sciences
5
651 - Office services
5
657 - Accounting
5
005 - Computer programming, programs & data
4
297 - Islam, Babism & Bahai Faith
4
331 - Labor economics
4
more ...