Classification
600 - Technology
700 - The arts; fine & decorative arts
620 - Engineering & allied operations
1,076
900 - History & geography
884
333 - Economics of land & energy
696
000 - Computer science, information & general works
491
363 - Other social problems & services
377
330 - Economics
365
610 - Medicine & health
348
380 - Commerce, communications & transportation
289
580 - Plants (Botany)
217
140 - Specific philosophical schools
201
576 - Genetics & evolution
168
320 - Political science
159
630 - Agriculture & related technologies
143
540 - Chemistry & allied sciences
108
500 - Natural sciences & mathematics
107
370 - Education
102
720 - Architecture
95
551 - Geology, hydrology & meteorology
86
340 - Law
85
414 - Phonology & phonetics
85
800 - Literature & rhetoric
59
658 - General management
56
400 - Language
54
100 - Philosophy & psychology
51
530 - Physics
51
300 - Social sciences
48
581 - Specific topics in natural history
39
170 - Ethics
30
304 - Factors affecting social behavior
27
410 - Linguistics
24
612 - Human physiology
24
780 - Music
20
301 - Sociology & anthropology
17
200 - Religion
16
770 - Photography, photographs & computer art
14
361 - Social problems & social welfare in general
12
615 - Pharmacology & therapeutics
10
657 - Accounting
7
160 - Logic
5
520 - Astronomy & allied sciences
5
120 - Epistemology, causation & humankind
4
350 - Public administration & military science
4
791 - Public performances
4
297 - Islam, Babism & Bahai Faith
3
550 - Earth sciences
3
650 - Management & auxiliary services
3
336 - Public finance
2
338 - Production
2
more ...