Classification
900 - History & geography
600 - Technology
78
620 - Engineering & allied operations
75
333 - Economics of land & energy
52
700 - The arts; fine & decorative arts
51
000 - Computer science, information & general works
25
363 - Other social problems & services
24
580 - Plants (Botany)
19
610 - Medicine & health
13
380 - Commerce, communications & transportation
12
576 - Genetics & evolution
10
530 - Physics
7
140 - Specific philosophical schools
6
414 - Phonology & phonetics
6
551 - Geology, hydrology & meteorology
6
630 - Agriculture & related technologies
6
340 - Law
5
330 - Economics
4
304 - Factors affecting social behavior
3
500 - Natural sciences & mathematics
3
540 - Chemistry & allied sciences
3
720 - Architecture
3
800 - Literature & rhetoric
3
370 - Education
2
550 - Earth sciences
2
770 - Photography, photographs & computer art
2
780 - Music
2
100 - Philosophy & psychology
1
300 - Social sciences
1
320 - Political science
1
520 - Astronomy & allied sciences
1
612 - Human physiology
1
657 - Accounting
1