Classification
363 - Other social problems & services
333 - Economics of land & energy
1,430
330 - Economics
1,386
600 - Technology
1,053
700 - The arts; fine & decorative arts
958
320 - Political science
835
620 - Engineering & allied operations
792
610 - Medicine & health
790
000 - Computer science, information & general works
660
551 - Geology, hydrology & meteorology
611
900 - History & geography
597
380 - Commerce, communications & transportation
524
630 - Agriculture & related technologies
427
140 - Specific philosophical schools
377
581 - Specific topics in natural history
308
580 - Plants (Botany)
286
500 - Natural sciences & mathematics
284
628 - Sanitary & municipal engineering
260
370 - Education
229
304 - Factors affecting social behavior
221
300 - Social sciences
190
576 - Genetics & evolution
185
540 - Chemistry & allied sciences
181
340 - Law
162
100 - Philosophy & psychology
129
658 - General management
126
720 - Architecture
126
800 - Literature & rhetoric
98
301 - Sociology & anthropology
80
414 - Phonology & phonetics
80
336 - Public finance
75
364 - Criminology
70
170 - Ethics
65
344 - Labor, social, education & cultural law
53
200 - Religion
52
400 - Language
49
612 - Human physiology
48
530 - Physics
45
331 - Labor economics
35
361 - Social problems & social welfare in general
32
327 - International relations
30
615 - Pharmacology & therapeutics
29
410 - Linguistics
20
590 - Animals (Zoology)
19
780 - Music
16
657 - Accounting
15
297 - Islam, Babism & Bahai Faith
12
550 - Earth sciences
12
350 - Public administration & military science
10
338 - Production
9
more ...