Classification
900 - History & geography
38
363 - Other social problems & services
15
700 - The arts; fine & decorative arts
10
330 - Economics
6
720 - Architecture
5
000 - Computer science, information & general works
4
200 - Religion
4
333 - Economics of land & energy
4
581 - Specific topics in natural history
4
380 - Commerce, communications & transportation
3
301 - Sociology & anthropology
2
320 - Political science
2
414 - Phonology & phonetics
2
590 - Animals (Zoology)
2
780 - Music
2
120 - Epistemology, causation & humankind
1
140 - Specific philosophical schools
1
300 - Social sciences
1
340 - Law
1
370 - Education
1
400 - Language
1
520 - Astronomy & allied sciences
1
530 - Physics
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
610 - Medicine & health
1
658 - General management
1
942 - England & Wales
1
966 - West Africa & offshore islands
1
972 - Middle America; Mexico
1