Classification
380 - Commerce, communications & transportation
600 - Technology
700 - The arts; fine & decorative arts
620 - Engineering & allied operations
192
900 - History & geography
179
333 - Economics of land & energy
150
000 - Computer science, information & general works
95
363 - Other social problems & services
79
330 - Economics
71
610 - Medicine & health
58
140 - Specific philosophical schools
49
576 - Genetics & evolution
37
320 - Political science
36
720 - Architecture
34
370 - Education
28
580 - Plants (Botany)
28
500 - Natural sciences & mathematics
19
551 - Geology, hydrology & meteorology
18
630 - Agriculture & related technologies
18
340 - Law
16
658 - General management
16
400 - Language
14
800 - Literature & rhetoric
13
414 - Phonology & phonetics
10
304 - Factors affecting social behavior
9
530 - Physics
9
581 - Specific topics in natural history
7
612 - Human physiology
7
300 - Social sciences
6
540 - Chemistry & allied sciences
6
100 - Philosophy & psychology
5
200 - Religion
4
361 - Social problems & social welfare in general
4
780 - Music
4
170 - Ethics
3
410 - Linguistics
3
657 - Accounting
3
301 - Sociology & anthropology
2
520 - Astronomy & allied sciences
2
650 - Management & auxiliary services
2
770 - Photography, photographs & computer art
2
791 - Public performances
2
120 - Epistemology, causation & humankind
1
160 - Logic
1
336 - Public finance
1