Classification
362 - Social welfare problems & services
616 - Diseases
6
610 - Medicine & health
5
500 - Natural sciences & mathematics
3
330 - Economics
2
658 - General management
2
900 - History & geography
2
000 - Computer science, information & general works
1
001 - Knowledge
1
300 - Social sciences
1
320 - Political science
1
361 - Social problems & social welfare in general
1
370 - Education
1
380 - Commerce, communications & transportation
1
381 - Commerce
1
384 - Communications; telecommunication
1
620 - Engineering & allied operations
1
670 - Manufacturing
1
700 - The arts; fine & decorative arts
1