Classification
900 - History & geography
600 - Technology
161
620 - Engineering & allied operations
155
333 - Economics of land & energy
116
700 - The arts; fine & decorative arts
95
363 - Other social problems & services
63
380 - Commerce, communications & transportation
51
330 - Economics
48
000 - Computer science, information & general works
42
580 - Plants (Botany)
29
610 - Medicine & health
29
576 - Genetics & evolution
22
720 - Architecture
21
551 - Geology, hydrology & meteorology
16
140 - Specific philosophical schools
15
320 - Political science
12
340 - Law
12
500 - Natural sciences & mathematics
11
630 - Agriculture & related technologies
9
414 - Phonology & phonetics
8
800 - Literature & rhetoric
8
370 - Education
7
540 - Chemistry & allied sciences
7
658 - General management
7
530 - Physics
4
300 - Social sciences
3
170 - Ethics
2
304 - Factors affecting social behavior
2
400 - Language
2
410 - Linguistics
2
581 - Specific topics in natural history
2
780 - Music
2
100 - Philosophy & psychology
1
120 - Epistemology, causation & humankind
1
297 - Islam, Babism & Bahai Faith
1
361 - Social problems & social welfare in general
1
550 - Earth sciences
1
650 - Management & auxiliary services
1
657 - Accounting
1
770 - Photography, photographs & computer art
1