Classification
006 - Special computer methods
23
577 - Ecology
11
004 - Data processing & computer science
9
621 - Applied physics
8
005 - Computer programming, programs & data
6
333 - Economics of land & energy
5
590 - Animals (Zoology)
5
612 - Human physiology
5
551 - Geology, hydrology & meteorology
4
304 - Factors affecting social behavior
3
519 - Probabilities & applied mathematics
3
550 - Earth sciences
3
591 - Specific topics in natural history
3
910 - Geography & travel
3
301 - Sociology & anthropology
2
305 - Social groups
2
572 - Biochemistry
2
576 - Genetics & evolution
2
003 - Systems
1
120 - Epistemology, causation & humankind
1
149 - Other philosophical systems
1
179 - Other ethical norms
1
323 - Civil & political rights
1
327 - International relations
1
330 - Economics
1
363 - Other social problems & services
1
500 - Natural sciences & mathematics
1
509 - Historical, geographic & persons treatment
1
531 - Classical mechanics; solid mechanics
1
571 - Physiology & related subjects
1
610 - Medicine & health
1
614 - Incidence & prevention of disease
1
636 - Animal husbandry
1
641 - Food & drink
1
664 - Food technology
1
808 - Rhetoric & collections of literature
1
809 - History, description & criticism
1
919 - Geography of & travel in other areas
1
930 - History of ancient world to ca. 499
1