Classification
005 - Computer programming, programs & data
1
304 - Factors affecting social behavior
2
306 - Culture & institutions
1
320 - Political science
1
333 - Economics of land & energy
8
338 - Production
1
363 - Other social problems & services
6
372 - Elementary education
1
500 - Natural sciences & mathematics
1
509 - Historical, geographic & persons treatment
1
520 - Astronomy & allied sciences
1
541 - Physical chemistry
1
546 - Inorganic chemistry
1
547 - Organic chemistry
2
550 - Earth sciences
2
551 - Geology, hydrology & meteorology
1
570 - Life sciences; biology
1
571 - Physiology & related subjects
2
572 - Biochemistry
3
576 - Genetics & evolution
1
577 - Ecology
6
579 - Microorganisms, fungi & algae
24
580 - Plants (Botany)
11
581 - Specific topics in natural history
8
599 - Mammals
1
610 - Medicine & health
4
611 - Human anatomy, cytology & histology
1
613 - Personal health & safety
1
616 - Diseases
47
617 - Surgery & related medical specialties
8
618 - Gynecology, obstetrics, pediatrics & geriatrics
3
621 - Applied physics
2
624 - Civil engineering
2
631 - Techniques, equipment & materials
2
634 - Orchards, fruits & forestry
2
650 - Management & auxiliary services
1
657 - Accounting
1
658 - General management
2
660 - Chemical engineering
3
670 - Manufacturing
3
910 - Geography & travel
1