Classification
600 - Technology
571
700 - The arts; fine & decorative arts
510
620 - Engineering & allied operations
482
333 - Economics of land & energy
463
000 - Computer science, information & general works
369
363 - Other social problems & services
340
900 - History & geography
332
330 - Economics
327
610 - Medicine & health
168
580 - Plants (Botany)
166
540 - Chemistry & allied sciences
151
551 - Geology, hydrology & meteorology
151
380 - Commerce, communications & transportation
150
576 - Genetics & evolution
101
140 - Specific philosophical schools
87
630 - Agriculture & related technologies
71
320 - Political science
70
414 - Phonology & phonetics
66
500 - Natural sciences & mathematics
66
530 - Physics
61
662 - Explosives, fuels & related products
45
581 - Specific topics in natural history
43
304 - Factors affecting social behavior
40
541 - Physical chemistry
36
660 - Chemical engineering
34
800 - Literature & rhetoric
34
628 - Sanitary & municipal engineering
32
720 - Architecture
32
658 - General management
28
621 - Applied physics
27
370 - Education
24
340 - Law
23
547 - Organic chemistry
19
612 - Human physiology
16
550 - Earth sciences
14
546 - Inorganic chemistry
13
668 - Technology of other organic products
13
338 - Production
10
665 - Industrial oils, fats, waxes & gases
10
526 - Mathematical geography
9
553 - Economic geology
9
577 - Ecology
9
657 - Accounting
9
300 - Social sciences
8
615 - Pharmacology & therapeutics
8
661 - Industrial chemicals
7
410 - Linguistics
5
650 - Management & auxiliary services
5
361 - Social problems & social welfare in general
4
543 - Analytical chemistry
4
more ...