Classification
600 - Technology
2,953
000 - Computer science, information & general works
2,645
700 - The arts; fine & decorative arts
2,343
900 - History & geography
2,160
333 - Economics of land & energy
1,496
620 - Engineering & allied operations
1,428
500 - Natural sciences & mathematics
1,401
610 - Medicine & health
1,159
363 - Other social problems & services
1,026
330 - Economics
954
300 - Social sciences
738
580 - Plants (Botany)
729
380 - Commerce, communications & transportation
718
320 - Political science
645
140 - Specific philosophical schools
582
800 - Literature & rhetoric
566
540 - Chemistry & allied sciences
531
576 - Genetics & evolution
516
100 - Philosophy & psychology
514
551 - Geology, hydrology & meteorology
424
340 - Law
391
370 - Education
371
400 - Language
330
530 - Physics
309
630 - Agriculture & related technologies
300
581 - Specific topics in natural history
298
200 - Religion
264
410 - Linguistics
204
414 - Phonology & phonetics
199
301 - Sociology & anthropology
195
304 - Factors affecting social behavior
191
612 - Human physiology
173
658 - General management
165
720 - Architecture
156
615 - Pharmacology & therapeutics
95
170 - Ethics
84
361 - Social problems & social welfare in general
84
780 - Music
76
297 - Islam, Babism & Bahai Faith
61
657 - Accounting
30
770 - Photography, photographs & computer art
30
120 - Epistemology, causation & humankind
25
520 - Astronomy & allied sciences
25
550 - Earth sciences
23
360 - Social problems & services; associations
18
590 - Animals (Zoology)
18
791 - Public performances
17
364 - Criminology
16
398 - Folklore
16
296 - Judaism
13
more ...