Classification
380 - Commerce, communications & transportation
600 - Technology
900 - History & geography
620 - Engineering & allied operations
290
700 - The arts; fine & decorative arts
181
333 - Economics of land & energy
154
363 - Other social problems & services
76
000 - Computer science, information & general works
69
330 - Economics
69
140 - Specific philosophical schools
44
720 - Architecture
32
320 - Political science
31
610 - Medicine & health
31
576 - Genetics & evolution
30
580 - Plants (Botany)
25
551 - Geology, hydrology & meteorology
22
340 - Law
21
370 - Education
19
500 - Natural sciences & mathematics
19
658 - General management
16
800 - Literature & rhetoric
14
400 - Language
12
300 - Social sciences
10
630 - Agriculture & related technologies
10
414 - Phonology & phonetics
9
304 - Factors affecting social behavior
8
530 - Physics
8
100 - Philosophy & psychology
7
410 - Linguistics
5
540 - Chemistry & allied sciences
5
780 - Music
5
200 - Religion
4
170 - Ethics
3
550 - Earth sciences
3
581 - Specific topics in natural history
3
612 - Human physiology
3
650 - Management & auxiliary services
2
657 - Accounting
2
770 - Photography, photographs & computer art
2
120 - Epistemology, causation & humankind
1
301 - Sociology & anthropology
1
361 - Social problems & social welfare in general
1