Classification
363 - Other social problems & services
620 - Engineering & allied operations
359
600 - Technology
354
900 - History & geography
110
333 - Economics of land & energy
100
551 - Geology, hydrology & meteorology
97
700 - The arts; fine & decorative arts
87
330 - Economics
65
630 - Agriculture & related technologies
48
581 - Specific topics in natural history
47
540 - Chemistry & allied sciences
42
320 - Political science
35
380 - Commerce, communications & transportation
33
610 - Medicine & health
31
500 - Natural sciences & mathematics
30
580 - Plants (Botany)
30
140 - Specific philosophical schools
27
628 - Sanitary & municipal engineering
27
000 - Computer science, information & general works
26
300 - Social sciences
15
370 - Education
13
576 - Genetics & evolution
12
340 - Law
10
658 - General management
10
720 - Architecture
8
800 - Literature & rhetoric
8
590 - Animals (Zoology)
7
301 - Sociology & anthropology
6
100 - Philosophy & psychology
5
304 - Factors affecting social behavior
5
414 - Phonology & phonetics
5
170 - Ethics
3
400 - Language
3
530 - Physics
3
331 - Labor economics
2
770 - Photography, photographs & computer art
2
160 - Logic
1
200 - Religion
1
297 - Islam, Babism & Bahai Faith
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
398 - Folklore
1
410 - Linguistics
1
519 - Probabilities & applied mathematics
1
612 - Human physiology
1
615 - Pharmacology & therapeutics
1
657 - Accounting
1
670 - Manufacturing
1