Classification
630 - Agriculture & related technologies
620 - Engineering & allied operations
447
600 - Technology
435
000 - Computer science, information & general works
144
700 - The arts; fine & decorative arts
126
363 - Other social problems & services
124
333 - Economics of land & energy
112
580 - Plants (Botany)
103
900 - History & geography
96
330 - Economics
84
610 - Medicine & health
78
551 - Geology, hydrology & meteorology
48
300 - Social sciences
47
320 - Political science
40
380 - Commerce, communications & transportation
36
581 - Specific topics in natural history
34
140 - Specific philosophical schools
30
540 - Chemistry & allied sciences
23
500 - Natural sciences & mathematics
22
414 - Phonology & phonetics
19
100 - Philosophy & psychology
17
576 - Genetics & evolution
17
720 - Architecture
17
340 - Law
12
170 - Ethics
11
658 - General management
11
800 - Literature & rhetoric
11
370 - Education
9
301 - Sociology & anthropology
8
400 - Language
8
410 - Linguistics
8
361 - Social problems & social welfare in general
7
304 - Factors affecting social behavior
6
200 - Religion
5
530 - Physics
4
612 - Human physiology
4
770 - Photography, photographs & computer art
4
780 - Music
4
364 - Criminology
3
350 - Public administration & military science
2
590 - Animals (Zoology)
2
664 - Food technology
2
297 - Islam, Babism & Bahai Faith
1
336 - Public finance
1
360 - Social problems & services; associations
1
550 - Earth sciences
1
657 - Accounting
1