Classification
910 - Geography & travel
1,448
304 - Factors affecting social behavior
1,157
551 - Geology, hydrology & meteorology
603
333 - Economics of land & energy
549
330 - Economics
467
363 - Other social problems & services
391
550 - Earth sciences
371
320 - Political science
362
577 - Ecology
259
700 - The arts; fine & decorative arts
219
900 - History & geography
202
140 - Specific philosophical schools
195
307 - Communities
192
300 - Social sciences
173
000 - Computer science, information & general works
138
500 - Natural sciences & mathematics
131
338 - Production
113
301 - Sociology & anthropology
107
630 - Agriculture & related technologies
88
306 - Culture & institutions
86
610 - Medicine & health
78
720 - Architecture
59
658 - General management
56
624 - Civil engineering
54
631 - Techniques, equipment & materials
54
600 - Technology
51
520 - Astronomy & allied sciences
49
581 - Specific topics in natural history
49
621 - Applied physics
47
380 - Commerce, communications & transportation
46
620 - Engineering & allied operations
46
370 - Education
45
303 - Social processes
41
305 - Social groups
39
580 - Plants (Botany)
35
820 - English & Old English literatures
33
578 - Natural history of organisms
32
340 - Law
31
576 - Genetics & evolution
28
414 - Phonology & phonetics
27
004 - Data processing & computer science
25
930 - History of ancient world to ca. 499
24
344 - Labor, social, education & cultural law
22
100 - Philosophy & psychology
21
400 - Language
21
519 - Probabilities & applied mathematics
21
530 - Physics
21
570 - Life sciences; biology
20
628 - Sanitary & municipal engineering
20
200 - Religion
19
more ...