Classification
363 - Other social problems & services
30
330 - Economics
28
628 - Sanitary & municipal engineering
26
600 - Technology
25
333 - Economics of land & energy
20
620 - Engineering & allied operations
20
700 - The arts; fine & decorative arts
20
900 - History & geography
18
000 - Computer science, information & general works
16
320 - Political science
11
580 - Plants (Botany)
10
660 - Chemical engineering
8
540 - Chemistry & allied sciences
7
610 - Medicine & health
7
551 - Geology, hydrology & meteorology
4
380 - Commerce, communications & transportation
3
500 - Natural sciences & mathematics
3
546 - Inorganic chemistry
3
304 - Factors affecting social behavior
2
362 - Social welfare problems & services
2
547 - Organic chemistry
2
576 - Genetics & evolution
2
577 - Ecology
2
615 - Pharmacology & therapeutics
2
630 - Agriculture & related technologies
2
662 - Explosives, fuels & related products
2
800 - Literature & rhetoric
2
338 - Production
1
340 - Law
1
353 - Specific fields of public administration
1
370 - Education
1
543 - Analytical chemistry
1
570 - Life sciences; biology
1
581 - Specific topics in natural history
1
604 - Special topics
1
614 - Incidence & prevention of disease
1
631 - Techniques, equipment & materials
1
657 - Accounting
1