Classification
620 - Engineering & allied operations
600 - Technology
1,303
900 - History & geography
887
700 - The arts; fine & decorative arts
654
333 - Economics of land & energy
496
000 - Computer science, information & general works
388
363 - Other social problems & services
370
330 - Economics
222
380 - Commerce, communications & transportation
215
610 - Medicine & health
203
580 - Plants (Botany)
194
630 - Agriculture & related technologies
192
540 - Chemistry & allied sciences
147
576 - Genetics & evolution
109
140 - Specific philosophical schools
106
500 - Natural sciences & mathematics
101
551 - Geology, hydrology & meteorology
96
320 - Political science
73
414 - Phonology & phonetics
59
720 - Architecture
59
340 - Law
55
530 - Physics
45
370 - Education
43
658 - General management
41
800 - Literature & rhetoric
40
300 - Social sciences
34
581 - Specific topics in natural history
34
400 - Language
29
304 - Factors affecting social behavior
27
100 - Philosophy & psychology
22
170 - Ethics
16
410 - Linguistics
12
361 - Social problems & social welfare in general
11
612 - Human physiology
11
770 - Photography, photographs & computer art
8
780 - Music
8
301 - Sociology & anthropology
7
615 - Pharmacology & therapeutics
4
657 - Accounting
4
120 - Epistemology, causation & humankind
3
550 - Earth sciences
3
200 - Religion
2
297 - Islam, Babism & Bahai Faith
2
336 - Public finance
2
360 - Social problems & services; associations
2
364 - Criminology
2
520 - Astronomy & allied sciences
2
160 - Logic
1
350 - Public administration & military science
1
398 - Folklore
1
more ...