Classification
580 - Plants (Botany)
97
516 - Geometry
70
576 - Genetics & evolution
64
581 - Specific topics in natural history
52
512 - Algebra
51
577 - Ecology
51
579 - Microorganisms, fungi & algae
48
610 - Medicine & health
44
616 - Diseases
42
005 - Computer programming, programs & data
35
571 - Physiology & related subjects
35
590 - Animals (Zoology)
30
333 - Economics of land & energy
27
515 - Analysis
26
572 - Biochemistry
22
620 - Engineering & allied operations
17
700 - The arts; fine & decorative arts
17
470 - Italic languages; Latin
16
510 - Mathematics
16
551 - Geology, hydrology & meteorology
16
000 - Computer science, information & general works
15
570 - Life sciences; biology
15
004 - Data processing & computer science
13
514 - Topology
13
578 - Natural history of organisms
13
615 - Pharmacology & therapeutics
13
630 - Agriculture & related technologies
12
003 - Systems
11
560 - Paleontology; paleozoology
11
500 - Natural sciences & mathematics
10
547 - Organic chemistry
10
592 - Invertebrates
10
634 - Orchards, fruits & forestry
10
660 - Chemical engineering
10
363 - Other social problems & services
9
140 - Specific philosophical schools
8
300 - Social sciences
8
301 - Sociology & anthropology
8
540 - Chemistry & allied sciences
8
612 - Human physiology
8
631 - Techniques, equipment & materials
8
006 - Special computer methods
7
380 - Commerce, communications & transportation
7
591 - Specific topics in natural history
7
611 - Human anatomy, cytology & histology
7
304 - Factors affecting social behavior
6
330 - Economics
6
400 - Language
6
410 - Linguistics
6
511 - General principles of mathematics
6
more ...