Classification
900 - History & geography
9,088
700 - The arts; fine & decorative arts
6,663
600 - Technology
5,901
610 - Medicine & health
5,558
333 - Economics of land & energy
4,231
620 - Engineering & allied operations
3,876
000 - Computer science, information & general works
3,860
320 - Political science
3,839
330 - Economics
3,694
300 - Social sciences
3,157
100 - Philosophy & psychology
2,978
370 - Education
2,783
363 - Other social problems & services
2,728
140 - Specific philosophical schools
2,417
380 - Commerce, communications & transportation
2,101
800 - Literature & rhetoric
2,093
500 - Natural sciences & mathematics
2,009
340 - Law
1,775
400 - Language
1,687
580 - Plants (Botany)
1,591
540 - Chemistry & allied sciences
1,524
410 - Linguistics
1,461
200 - Religion
1,386
530 - Physics
1,342
576 - Genetics & evolution
1,169
301 - Sociology & anthropology
1,084
551 - Geology, hydrology & meteorology
970
581 - Specific topics in natural history
822
304 - Factors affecting social behavior
798
630 - Agriculture & related technologies
790
720 - Architecture
781
612 - Human physiology
667
170 - Ethics
634
780 - Music
499
414 - Phonology & phonetics
486
615 - Pharmacology & therapeutics
381
658 - General management
360
361 - Social problems & social welfare in general
345
297 - Islam, Babism & Bahai Faith
286
120 - Epistemology, causation & humankind
157
296 - Judaism
138
791 - Public performances
138
770 - Photography, photographs & computer art
127
364 - Criminology
116
350 - Public administration & military science
113
360 - Social problems & services; associations
109
657 - Accounting
100
520 - Astronomy & allied sciences
93
398 - Folklore
91
590 - Animals (Zoology)
84
more ...