Classification
333 - Economics of land & energy
330 - Economics
1,985
320 - Political science
1,889
600 - Technology
1,590
363 - Other social problems & services
1,382
700 - The arts; fine & decorative arts
1,379
610 - Medicine & health
1,065
620 - Engineering & allied operations
1,047
000 - Computer science, information & general works
976
900 - History & geography
885
380 - Commerce, communications & transportation
718
370 - Education
479
140 - Specific philosophical schools
446
304 - Factors affecting social behavior
427
580 - Plants (Botany)
397
530 - Physics
370
630 - Agriculture & related technologies
332
500 - Natural sciences & mathematics
296
551 - Geology, hydrology & meteorology
290
576 - Genetics & evolution
274
540 - Chemistry & allied sciences
228
100 - Philosophy & psychology
226
338 - Production
225
581 - Specific topics in natural history
180
340 - Law
177
300 - Social sciences
166
720 - Architecture
146
658 - General management
116
414 - Phonology & phonetics
108
400 - Language
98
800 - Literature & rhetoric
98
621 - Applied physics
93
336 - Public finance
91
170 - Ethics
68
612 - Human physiology
64
361 - Social problems & social welfare in general
44
200 - Religion
41
301 - Sociology & anthropology
41
410 - Linguistics
40
615 - Pharmacology & therapeutics
35
657 - Accounting
22
780 - Music
22
350 - Public administration & military science
21
297 - Islam, Babism & Bahai Faith
18
520 - Astronomy & allied sciences
17
791 - Public performances
15
120 - Epistemology, causation & humankind
13
770 - Photography, photographs & computer art
13
650 - Management & auxiliary services
11
550 - Earth sciences
10
more ...