Classification
380 - Commerce, communications & transportation
600 - Technology
700 - The arts; fine & decorative arts
900 - History & geography
620 - Engineering & allied operations
170
333 - Economics of land & energy
101
363 - Other social problems & services
48
330 - Economics
46
000 - Computer science, information & general works
45
720 - Architecture
28
140 - Specific philosophical schools
27
610 - Medicine & health
27
576 - Genetics & evolution
25
320 - Political science
17
370 - Education
15
580 - Plants (Botany)
15
551 - Geology, hydrology & meteorology
12
500 - Natural sciences & mathematics
11
340 - Law
10
658 - General management
10
400 - Language
9
630 - Agriculture & related technologies
9
800 - Literature & rhetoric
7
100 - Philosophy & psychology
5
530 - Physics
5
300 - Social sciences
4
304 - Factors affecting social behavior
4
414 - Phonology & phonetics
4
540 - Chemistry & allied sciences
4
780 - Music
4
612 - Human physiology
3
170 - Ethics
2
200 - Religion
2
410 - Linguistics
2
581 - Specific topics in natural history
2
770 - Photography, photographs & computer art
2
120 - Epistemology, causation & humankind
1
361 - Social problems & social welfare in general
1
650 - Management & auxiliary services
1