Classification
540 - Chemistry & allied sciences
620 - Engineering & allied operations
187
600 - Technology
117
363 - Other social problems & services
65
700 - The arts; fine & decorative arts
57
900 - History & geography
55
000 - Computer science, information & general works
52
333 - Economics of land & energy
51
610 - Medicine & health
27
140 - Specific philosophical schools
19
380 - Commerce, communications & transportation
17
330 - Economics
15
500 - Natural sciences & mathematics
15
580 - Plants (Botany)
14
576 - Genetics & evolution
13
630 - Agriculture & related technologies
12
530 - Physics
9
414 - Phonology & phonetics
8
551 - Geology, hydrology & meteorology
8
720 - Architecture
8
370 - Education
7
581 - Specific topics in natural history
7
300 - Social sciences
6
590 - Animals (Zoology)
6
612 - Human physiology
6
800 - Literature & rhetoric
5
304 - Factors affecting social behavior
4
320 - Political science
4
400 - Language
3
658 - General management
3
100 - Philosophy & psychology
2
301 - Sociology & anthropology
2
340 - Law
2
410 - Linguistics
2
615 - Pharmacology & therapeutics
2
120 - Epistemology, causation & humankind
1
361 - Social problems & social welfare in general
1
520 - Astronomy & allied sciences
1
657 - Accounting
1