Classification
330 - Economics
551 - Geology, hydrology & meteorology
363 - Other social problems & services
169
333 - Economics of land & energy
136
000 - Computer science, information & general works
96
700 - The arts; fine & decorative arts
90
320 - Political science
86
600 - Technology
76
140 - Specific philosophical schools
49
380 - Commerce, communications & transportation
49
610 - Medicine & health
46
620 - Engineering & allied operations
43
581 - Specific topics in natural history
39
630 - Agriculture & related technologies
38
900 - History & geography
37
580 - Plants (Botany)
31
370 - Education
19
658 - General management
16
300 - Social sciences
13
340 - Law
12
720 - Architecture
12
304 - Factors affecting social behavior
11
100 - Philosophy & psychology
10
170 - Ethics
9
576 - Genetics & evolution
9
800 - Literature & rhetoric
9
500 - Natural sciences & mathematics
8
414 - Phonology & phonetics
7
540 - Chemistry & allied sciences
5
530 - Physics
4
657 - Accounting
4
200 - Religion
3
297 - Islam, Babism & Bahai Faith
3
361 - Social problems & social welfare in general
3
550 - Earth sciences
3
350 - Public administration & military science
2
360 - Social problems & services; associations
2
400 - Language
2
520 - Astronomy & allied sciences
2
301 - Sociology & anthropology
1
336 - Public finance
1
410 - Linguistics
1
590 - Animals (Zoology)
1
612 - Human physiology
1