Classification
330 - Economics
320 - Political science
318
300 - Social sciences
87
700 - The arts; fine & decorative arts
52
333 - Economics of land & energy
42
610 - Medicine & health
42
900 - History & geography
42
000 - Computer science, information & general works
40
363 - Other social problems & services
35
140 - Specific philosophical schools
29
630 - Agriculture & related technologies
27
380 - Commerce, communications & transportation
25
600 - Technology
25
551 - Geology, hydrology & meteorology
22
340 - Law
16
370 - Education
16
304 - Factors affecting social behavior
15
580 - Plants (Botany)
15
620 - Engineering & allied operations
13
658 - General management
13
576 - Genetics & evolution
10
100 - Philosophy & psychology
8
170 - Ethics
8
581 - Specific topics in natural history
7
200 - Religion
5
361 - Social problems & social welfare in general
5
500 - Natural sciences & mathematics
5
720 - Architecture
5
302 - Social interaction
3
414 - Phonology & phonetics
3
800 - Literature & rhetoric
3
301 - Sociology & anthropology
2
350 - Public administration & military science
2
550 - Earth sciences
2
338 - Production
1
372 - Elementary education
1
381 - Commerce
1
382 - International commerce
1
400 - Language
1
410 - Linguistics
1
520 - Astronomy & allied sciences
1
530 - Physics
1
540 - Chemistry & allied sciences
1
612 - Human physiology
1
615 - Pharmacology & therapeutics
1
657 - Accounting
1
670 - Manufacturing
1