Classification
363 - Other social problems & services
333 - Economics of land & energy
1,192
330 - Economics
1,145
600 - Technology
947
700 - The arts; fine & decorative arts
796
620 - Engineering & allied operations
719
610 - Medicine & health
710
000 - Computer science, information & general works
630
320 - Political science
585
551 - Geology, hydrology & meteorology
544
900 - History & geography
509
380 - Commerce, communications & transportation
443
140 - Specific philosophical schools
336
630 - Agriculture & related technologies
307
580 - Plants (Botany)
267
500 - Natural sciences & mathematics
259
581 - Specific topics in natural history
250
628 - Sanitary & municipal engineering
187
370 - Education
179
576 - Genetics & evolution
179
304 - Factors affecting social behavior
175
540 - Chemistry & allied sciences
154
658 - General management
119
340 - Law
116
720 - Architecture
97
300 - Social sciences
93
100 - Philosophy & psychology
92
800 - Literature & rhetoric
87
364 - Criminology
69
414 - Phonology & phonetics
66
336 - Public finance
56
170 - Ethics
49
301 - Sociology & anthropology
47
612 - Human physiology
47
400 - Language
40
530 - Physics
36
200 - Religion
33
331 - Labor economics
33
361 - Social problems & social welfare in general
32
615 - Pharmacology & therapeutics
28
344 - Labor, social, education & cultural law
26
410 - Linguistics
18
327 - International relations
15
590 - Animals (Zoology)
15
657 - Accounting
12
297 - Islam, Babism & Bahai Faith
10
780 - Music
10
338 - Production
9
791 - Public performances
9
350 - Public administration & military science
8
more ...