Classification
620 - Engineering & allied operations
600 - Technology
73
900 - History & geography
53
700 - The arts; fine & decorative arts
42
333 - Economics of land & energy
34
380 - Commerce, communications & transportation
26
621 - Applied physics
23
000 - Computer science, information & general works
18
363 - Other social problems & services
18
384 - Communications; telecommunication
12
580 - Plants (Botany)
11
330 - Economics
10
610 - Medicine & health
9
540 - Chemistry & allied sciences
8
630 - Agriculture & related technologies
7
530 - Physics
6
576 - Genetics & evolution
6
414 - Phonology & phonetics
5
500 - Natural sciences & mathematics
5
140 - Specific philosophical schools
4
551 - Geology, hydrology & meteorology
4
320 - Political science
3
550 - Earth sciences
3
800 - Literature & rhetoric
3
304 - Factors affecting social behavior
2
340 - Law
2
658 - General management
2
720 - Architecture
2
331 - Labor economics
1
370 - Education
1
537 - Electricity & electronics
1
541 - Physical chemistry
1
604 - Special topics
1
657 - Accounting
1
660 - Chemical engineering
1
745 - Decorative arts
1