Classification
610 - Medicine & health
81
380 - Commerce, communications & transportation
15
700 - The arts; fine & decorative arts
14
370 - Education
10
363 - Other social problems & services
7
000 - Computer science, information & general works
5
600 - Technology
5
330 - Economics
4
100 - Philosophy & psychology
3
170 - Ethics
2
306 - Culture & institutions
2
540 - Chemistry & allied sciences
2
613 - Personal health & safety
2
616 - Diseases
2
333 - Economics of land & energy
1
338 - Production
1
340 - Law
1
361 - Social problems & social welfare in general
1
400 - Language
1
615 - Pharmacology & therapeutics
1
620 - Engineering & allied operations
1
628 - Sanitary & municipal engineering
1