Classification
930 - History of ancient world to ca. 499
31
900 - History & geography
25
004 - Data processing & computer science
10
910 - Geography & travel
9
301 - Sociology & anthropology
8
304 - Factors affecting social behavior
8
300 - Social sciences
6
577 - Ecology
6
330 - Economics
5
551 - Geology, hydrology & meteorology
5
560 - Paleontology; paleozoology
5
006 - Special computer methods
3
200 - Religion
3
320 - Political science
3
333 - Economics of land & energy
3
363 - Other social problems & services
3
576 - Genetics & evolution
3
620 - Engineering & allied operations
3
631 - Techniques, equipment & materials
3
005 - Computer programming, programs & data
2
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
519 - Probabilities & applied mathematics
2
538 - Magnetism
2
540 - Chemistry & allied sciences
2
550 - Earth sciences
2
570 - Life sciences; biology
2
700 - The arts; fine & decorative arts
2
809 - History, description & criticism
2
933 - Palestine to 70
2
936 - Europe north & west of Italy to ca. 499
2
000 - Computer science, information & general works
1
001 - Knowledge
1
025 - Library operations
1
296 - Judaism
1
306 - Culture & institutions
1
331 - Labor economics
1
370 - Education
1
371 - Schools & their activities; special education
1
398 - Folklore
1
400 - Language
1
501 - Philosophy & theory
1
511 - General principles of mathematics
1
543 - Analytical chemistry
1
546 - Inorganic chemistry
1
549 - Mineralogy
1
579 - Microorganisms, fungi & algae
1
580 - Plants (Botany)
1
599 - Mammals
1
610 - Medicine & health
1
more ...