Classification
610 - Medicine & health
49
380 - Commerce, communications & transportation
9
370 - Education
6
700 - The arts; fine & decorative arts
5
330 - Economics
4
000 - Computer science, information & general works
3
363 - Other social problems & services
3
306 - Culture & institutions
2
600 - Technology
2
613 - Personal health & safety
2
616 - Diseases
2
100 - Philosophy & psychology
1
170 - Ethics
1
333 - Economics of land & energy
1
338 - Production
1
340 - Law
1
400 - Language
1
615 - Pharmacology & therapeutics
1