Classification
560 - Paleontology; paleozoology
151
551 - Geology, hydrology & meteorology
92
576 - Genetics & evolution
61
550 - Earth sciences
29
590 - Animals (Zoology)
21
930 - History of ancient world to ca. 499
18
577 - Ecology
17
571 - Physiology & related subjects
16
301 - Sociology & anthropology
15
910 - Geography & travel
14
333 - Economics of land & energy
11
578 - Natural history of organisms
11
570 - Life sciences; biology
10
900 - History & geography
8
000 - Computer science, information & general works
7
300 - Social sciences
7
581 - Specific topics in natural history
7
363 - Other social problems & services
6
580 - Plants (Botany)
6
700 - The arts; fine & decorative arts
6
596 - Chordates
5
001 - Knowledge
4
330 - Economics
4
572 - Biochemistry
4
591 - Specific topics in natural history
4
612 - Human physiology
4
140 - Specific philosophical schools
3
320 - Political science
3
553 - Economic geology
3
599 - Mammals
3
610 - Medicine & health
3
616 - Diseases
3
620 - Engineering & allied operations
3
621 - Applied physics
3
004 - Data processing & computer science
2
100 - Philosophy & psychology
2
304 - Factors affecting social behavior
2
414 - Phonology & phonetics
2
500 - Natural sciences & mathematics
2
509 - Historical, geographic & persons treatment
2
520 - Astronomy & allied sciences
2
523 - Specific celestial bodies & phenomena
2
540 - Chemistry & allied sciences
2
541 - Physical chemistry
2
549 - Mineralogy
2
592 - Invertebrates
2
617 - Surgery & related medical specialties
2
629 - Other branches of engineering
2
006 - Special computer methods
1
155 - Differential & developmental psychology
1
more ...