Classification
560 - Paleontology; paleozoology
149
551 - Geology, hydrology & meteorology
63
576 - Genetics & evolution
33
550 - Earth sciences
20
301 - Sociology & anthropology
14
571 - Physiology & related subjects
12
930 - History of ancient world to ca. 499
12
577 - Ecology
11
590 - Animals (Zoology)
11
910 - Geography & travel
11
578 - Natural history of organisms
10
900 - History & geography
8
333 - Economics of land & energy
6
581 - Specific topics in natural history
5
000 - Computer science, information & general works
4
570 - Life sciences; biology
4
580 - Plants (Botany)
4
596 - Chordates
4
700 - The arts; fine & decorative arts
4
300 - Social sciences
3
330 - Economics
3
363 - Other social problems & services
3
599 - Mammals
3
140 - Specific philosophical schools
2
320 - Political science
2
540 - Chemistry & allied sciences
2
541 - Physical chemistry
2
549 - Mineralogy
2
553 - Economic geology
2
592 - Invertebrates
2
612 - Human physiology
2
621 - Applied physics
2
629 - Other branches of engineering
2
100 - Philosophy & psychology
1
155 - Differential & developmental psychology
1
220 - Bible
1
304 - Factors affecting social behavior
1
414 - Phonology & phonetics
1
509 - Historical, geographic & persons treatment
1
519 - Probabilities & applied mathematics
1
520 - Astronomy & allied sciences
1
530 - Physics
1
559 - Earth sciences of other areas
1
561 - Paleobotany; fossil microorganisms
1
567 - Fossil cold-blooded vertebrates; fossil fishes
1
610 - Medicine & health
1
611 - Human anatomy, cytology & histology
1
616 - Diseases
1
617 - Surgery & related medical specialties
1
624 - Civil engineering
1
more ...