Classification
500 - Natural sciences & mathematics
600 - Technology
620 - Engineering & allied operations
900 - History & geography
81
700 - The arts; fine & decorative arts
65
333 - Economics of land & energy
64
363 - Other social problems & services
36
000 - Computer science, information & general works
31
380 - Commerce, communications & transportation
29
330 - Economics
26
576 - Genetics & evolution
20
580 - Plants (Botany)
20
610 - Medicine & health
19
630 - Agriculture & related technologies
19
540 - Chemistry & allied sciences
17
340 - Law
16
530 - Physics
15
370 - Education
14
581 - Specific topics in natural history
12
140 - Specific philosophical schools
10
720 - Architecture
10
320 - Political science
9
551 - Geology, hydrology & meteorology
8
100 - Philosophy & psychology
6
300 - Social sciences
6
414 - Phonology & phonetics
6
400 - Language
5
658 - General management
5
800 - Literature & rhetoric
4
304 - Factors affecting social behavior
2
657 - Accounting
2
780 - Music
2
120 - Epistemology, causation & humankind
1
170 - Ethics
1
410 - Linguistics
1
520 - Astronomy & allied sciences
1
550 - Earth sciences
1
612 - Human physiology
1