Classification
500 - Natural sciences & mathematics
620 - Engineering & allied operations
155
600 - Technology
119
900 - History & geography
83
700 - The arts; fine & decorative arts
76
333 - Economics of land & energy
73
000 - Computer science, information & general works
46
363 - Other social problems & services
46
380 - Commerce, communications & transportation
36
330 - Economics
26
576 - Genetics & evolution
26
610 - Medicine & health
25
580 - Plants (Botany)
20
140 - Specific philosophical schools
19
370 - Education
18
340 - Law
16
530 - Physics
16
720 - Architecture
15
551 - Geology, hydrology & meteorology
14
540 - Chemistry & allied sciences
11
414 - Phonology & phonetics
10
300 - Social sciences
9
581 - Specific topics in natural history
9
320 - Political science
7
400 - Language
7
100 - Philosophy & psychology
6
630 - Agriculture & related technologies
6
800 - Literature & rhetoric
6
612 - Human physiology
5
658 - General management
5
780 - Music
4
590 - Animals (Zoology)
3
657 - Accounting
3
120 - Epistemology, causation & humankind
2
304 - Factors affecting social behavior
2
520 - Astronomy & allied sciences
2
410 - Linguistics
1
920 - Biography, genealogy & insignia
1