Classification
363 - Other social problems & services
23
333 - Economics of land & energy
6
330 - Economics
5
580 - Plants (Botany)
5
700 - The arts; fine & decorative arts
4
900 - History & geography
4
000 - Computer science, information & general works
3
304 - Factors affecting social behavior
3
551 - Geology, hydrology & meteorology
3
581 - Specific topics in natural history
3
610 - Medicine & health
3
620 - Engineering & allied operations
3
338 - Production
2
600 - Technology
2
956 - Middle East (Near East)
2
300 - Social sciences
1
301 - Sociology & anthropology
1
370 - Education
1
500 - Natural sciences & mathematics
1
520 - Astronomy & allied sciences
1
530 - Physics
1
540 - Chemistry & allied sciences
1
570 - Life sciences; biology
1
576 - Genetics & evolution
1
614 - Incidence & prevention of disease
1
628 - Sanitary & municipal engineering
1
919 - Geography of & travel in other areas
1
966 - West Africa & offshore islands
1