Classification
620 - Engineering & allied operations
630 - Agriculture & related technologies
600 - Technology
293
000 - Computer science, information & general works
125
580 - Plants (Botany)
84
700 - The arts; fine & decorative arts
84
363 - Other social problems & services
77
333 - Economics of land & energy
75
900 - History & geography
75
610 - Medicine & health
62
330 - Economics
57
551 - Geology, hydrology & meteorology
38
300 - Social sciences
27
320 - Political science
24
140 - Specific philosophical schools
23
380 - Commerce, communications & transportation
23
581 - Specific topics in natural history
22
576 - Genetics & evolution
14
540 - Chemistry & allied sciences
12
100 - Philosophy & psychology
11
720 - Architecture
11
340 - Law
10
414 - Phonology & phonetics
9
658 - General management
9
800 - Literature & rhetoric
9
170 - Ethics
8
400 - Language
7
361 - Social problems & social welfare in general
6
410 - Linguistics
6
304 - Factors affecting social behavior
5
370 - Education
4
500 - Natural sciences & mathematics
4
612 - Human physiology
4
200 - Religion
3
770 - Photography, photographs & computer art
3
301 - Sociology & anthropology
2
364 - Criminology
2
590 - Animals (Zoology)
2
780 - Music
2
297 - Islam, Babism & Bahai Faith
1
336 - Public finance
1
550 - Earth sciences
1
657 - Accounting
1