Classification
620 - Engineering & allied operations
600 - Technology
298
900 - History & geography
254
700 - The arts; fine & decorative arts
179
333 - Economics of land & energy
131
500 - Natural sciences & mathematics
105
000 - Computer science, information & general works
95
005 - Computer programming, programs & data
89
331 - Labor economics
89
380 - Commerce, communications & transportation
83
363 - Other social problems & services
73
384 - Communications; telecommunication
67
330 - Economics
59
610 - Medicine & health
51
140 - Specific philosophical schools
41
580 - Plants (Botany)
36
576 - Genetics & evolution
31
658 - General management
31
621 - Applied physics
20
540 - Chemistry & allied sciences
19
630 - Agriculture & related technologies
18
720 - Architecture
18
414 - Phonology & phonetics
17
530 - Physics
17
374 - Adult education
16
340 - Law
13
320 - Political science
12
551 - Geology, hydrology & meteorology
12
800 - Literature & rhetoric
12
370 - Education
11
400 - Language
8
006 - Special computer methods
7
410 - Linguistics
6
629 - Other branches of engineering
6
681 - Precision instruments & other devices
6
004 - Data processing & computer science
5
364 - Criminology
5
510 - Mathematics
5
745 - Decorative arts
5
302 - Social interaction
4
304 - Factors affecting social behavior
4
338 - Production
4
550 - Earth sciences
4
100 - Philosophy & psychology
3
657 - Accounting
3
770 - Photography, photographs & computer art
3
781 - General principles & musical forms
3
381 - Commerce
2
660 - Chemical engineering
2
001 - Knowledge
1
more ...