Classification
576 - Genetics & evolution
900 - History & geography
330 - Economics
375
320 - Political science
373
600 - Technology
131
700 - The arts; fine & decorative arts
128
620 - Engineering & allied operations
124
333 - Economics of land & energy
77
300 - Social sciences
72
000 - Computer science, information & general works
51
363 - Other social problems & services
43
380 - Commerce, communications & transportation
38
140 - Specific philosophical schools
27
340 - Law
25
610 - Medicine & health
24
580 - Plants (Botany)
23
100 - Philosophy & psychology
20
800 - Literature & rhetoric
20
500 - Natural sciences & mathematics
17
720 - Architecture
16
200 - Religion
15
414 - Phonology & phonetics
15
301 - Sociology & anthropology
13
304 - Factors affecting social behavior
13
370 - Education
13
400 - Language
12
581 - Specific topics in natural history
12
530 - Physics
9
551 - Geology, hydrology & meteorology
8
630 - Agriculture & related technologies
8
658 - General management
8
410 - Linguistics
6
540 - Chemistry & allied sciences
6
170 - Ethics
5
297 - Islam, Babism & Bahai Faith
5
780 - Music
4
361 - Social problems & social welfare in general
3
770 - Photography, photographs & computer art
3
296 - Judaism
2
364 - Criminology
2
650 - Management & auxiliary services
2
791 - Public performances
2
120 - Epistemology, causation & humankind
1
343 - Military, tax, trade & industrial law
1
350 - Public administration & military science
1
360 - Social problems & services; associations
1
398 - Folklore
1
550 - Earth sciences
1
973 - United States
1