Classification
330 - Economics
363 - Other social problems & services
600 - Technology
333 - Economics of land & energy
179
620 - Engineering & allied operations
139
700 - The arts; fine & decorative arts
102
900 - History & geography
90
000 - Computer science, information & general works
76
320 - Political science
76
380 - Commerce, communications & transportation
66
610 - Medicine & health
57
551 - Geology, hydrology & meteorology
48
370 - Education
43
630 - Agriculture & related technologies
40
140 - Specific philosophical schools
39
580 - Plants (Botany)
39
581 - Specific topics in natural history
31
658 - General management
26
576 - Genetics & evolution
19
304 - Factors affecting social behavior
16
300 - Social sciences
14
720 - Architecture
13
800 - Literature & rhetoric
13
340 - Law
12
400 - Language
8
500 - Natural sciences & mathematics
8
657 - Accounting
7
200 - Religion
5
350 - Public administration & military science
5
540 - Chemistry & allied sciences
5
100 - Philosophy & psychology
3
170 - Ethics
3
297 - Islam, Babism & Bahai Faith
3
410 - Linguistics
3
530 - Physics
3
360 - Social problems & services; associations
2
361 - Social problems & social welfare in general
2
414 - Phonology & phonetics
2
615 - Pharmacology & therapeutics
2
160 - Logic
1
301 - Sociology & anthropology
1
336 - Public finance
1
520 - Astronomy & allied sciences
1
550 - Earth sciences
1
612 - Human physiology
1
650 - Management & auxiliary services
1
791 - Public performances
1