Classification
658 - General management
339
330 - Economics
237
600 - Technology
198
000 - Computer science, information & general works
197
700 - The arts; fine & decorative arts
195
333 - Economics of land & energy
182
610 - Medicine & health
143
620 - Engineering & allied operations
133
363 - Other social problems & services
107
005 - Computer programming, programs & data
101
380 - Commerce, communications & transportation
98
900 - History & geography
90
332 - Financial economics
89
140 - Specific philosophical schools
71
580 - Plants (Botany)
66
500 - Natural sciences & mathematics
64
320 - Political science
54
576 - Genetics & evolution
49
630 - Agriculture & related technologies
42
338 - Production
35
670 - Manufacturing
35
381 - Commerce
33
551 - Geology, hydrology & meteorology
33
540 - Chemistry & allied sciences
28
370 - Education
22
304 - Factors affecting social behavior
20
720 - Architecture
19
004 - Data processing & computer science
18
581 - Specific topics in natural history
17
340 - Law
16
414 - Phonology & phonetics
16
800 - Literature & rhetoric
16
361 - Social problems & social welfare in general
12
519 - Probabilities & applied mathematics
12
100 - Philosophy & psychology
11
530 - Physics
11
006 - Special computer methods
9
331 - Labor economics
9
410 - Linguistics
9
300 - Social sciences
8
302 - Social interaction
8
615 - Pharmacology & therapeutics
7
657 - Accounting
7
003 - Systems
6
570 - Life sciences; biology
6
621 - Applied physics
6
650 - Management & auxiliary services
6
510 - Mathematics
5
170 - Ethics
4
400 - Language
4
more ...