Classification
333 - Economics of land & energy
580 - Plants (Botany)
600 - Technology
620 - Engineering & allied operations
121
700 - The arts; fine & decorative arts
95
900 - History & geography
92
330 - Economics
65
363 - Other social problems & services
65
000 - Computer science, information & general works
61
610 - Medicine & health
39
630 - Agriculture & related technologies
39
380 - Commerce, communications & transportation
27
576 - Genetics & evolution
21
551 - Geology, hydrology & meteorology
18
140 - Specific philosophical schools
15
500 - Natural sciences & mathematics
15
658 - General management
13
414 - Phonology & phonetics
11
720 - Architecture
10
320 - Political science
9
581 - Specific topics in natural history
9
540 - Chemistry & allied sciences
8
340 - Law
7
800 - Literature & rhetoric
7
370 - Education
6
530 - Physics
6
304 - Factors affecting social behavior
5
400 - Language
4
170 - Ethics
3
300 - Social sciences
2
336 - Public finance
2
361 - Social problems & social welfare in general
2
100 - Philosophy & psychology
1
297 - Islam, Babism & Bahai Faith
1
410 - Linguistics
1
520 - Astronomy & allied sciences
1
590 - Animals (Zoology)
1
612 - Human physiology
1
615 - Pharmacology & therapeutics
1