Classification
363 - Other social problems & services
610 - Medicine & health
330 - Economics
39
333 - Economics of land & energy
28
600 - Technology
25
000 - Computer science, information & general works
23
320 - Political science
22
700 - The arts; fine & decorative arts
22
304 - Factors affecting social behavior
18
370 - Education
18
140 - Specific philosophical schools
17
630 - Agriculture & related technologies
14
551 - Geology, hydrology & meteorology
13
620 - Engineering & allied operations
12
380 - Commerce, communications & transportation
11
900 - History & geography
10
340 - Law
7
580 - Plants (Botany)
7
170 - Ethics
6
658 - General management
6
576 - Genetics & evolution
5
720 - Architecture
5
361 - Social problems & social welfare in general
3
540 - Chemistry & allied sciences
3
581 - Specific topics in natural history
3
100 - Philosophy & psychology
2
360 - Social problems & services; associations
2
550 - Earth sciences
2
025 - Library operations
1
300 - Social sciences
1
301 - Sociology & anthropology
1
338 - Production
1
400 - Language
1
410 - Linguistics
1
509 - Historical, geographic & persons treatment
1
612 - Human physiology
1
613 - Personal health & safety
1
615 - Pharmacology & therapeutics
1
629 - Other branches of engineering
1
657 - Accounting
1
660 - Chemical engineering
1
780 - Music
1
800 - Literature & rhetoric
1