Classification
930 - History of ancient world to ca. 499
296
551 - Geology, hydrology & meteorology
47
301 - Sociology & anthropology
43
910 - Geography & travel
43
304 - Factors affecting social behavior
39
560 - Paleontology; paleozoology
30
006 - Special computer methods
27
004 - Data processing & computer science
26
550 - Earth sciences
25
363 - Other social problems & services
23
005 - Computer programming, programs & data
22
520 - Astronomy & allied sciences
19
306 - Culture & institutions
17
333 - Economics of land & energy
17
620 - Engineering & allied operations
16
900 - History & geography
16
500 - Natural sciences & mathematics
11
519 - Probabilities & applied mathematics
11
577 - Ecology
11
300 - Social sciences
10
305 - Social groups
8
330 - Economics
8
340 - Law
8
621 - Applied physics
8
576 - Genetics & evolution
7
631 - Techniques, equipment & materials
7
690 - Buildings
7
025 - Library operations
6
530 - Physics
6
539 - Modern physics
6
543 - Analytical chemistry
6
624 - Civil engineering
6
307 - Communities
5
501 - Philosophy & theory
5
549 - Mineralogy
5
570 - Life sciences; biology
5
720 - Architecture
5
809 - History, description & criticism
5
003 - Systems
4
578 - Natural history of organisms
4
579 - Microorganisms, fungi & algae
4
791 - Public performances
4
142 - Critical philosophy
3
200 - Religion
3
320 - Political science
3
371 - Schools & their activities; special education
3
509 - Historical, geographic & persons treatment
3
510 - Mathematics
3
541 - Physical chemistry
3
599 - Mammals
3
more ...