Classification
610 - Medicine & health
16
333 - Economics of land & energy
14
000 - Computer science, information & general works
13
572 - Biochemistry
9
580 - Plants (Botany)
9
570 - Life sciences; biology
8
571 - Physiology & related subjects
8
380 - Commerce, communications & transportation
7
700 - The arts; fine & decorative arts
7
140 - Specific philosophical schools
6
600 - Technology
6
547 - Organic chemistry
5
576 - Genetics & evolution
5
363 - Other social problems & services
3
620 - Engineering & allied operations
3
664 - Food technology
3
900 - History & geography
3
304 - Factors affecting social behavior
2
548 - Crystallography
2
574 - [Unassigned]
2
581 - Specific topics in natural history
2
611 - Human anatomy, cytology & histology
2
630 - Agriculture & related technologies
2
500 - Natural sciences & mathematics
1
530 - Physics
1
540 - Chemistry & allied sciences
1
541 - Physical chemistry
1
542 - Techniques, equipment & materials
1
546 - Inorganic chemistry
1
573 - Specific physiological systems in animals
1
612 - Human physiology
1
615 - Pharmacology & therapeutics
1
660 - Chemical engineering
1
661 - Industrial chemicals
1