Classification
001 - Knowledge
2
004 - Data processing & computer science
1
005 - Computer programming, programs & data
4
153 - Mental processes & intelligence
3
158 - Applied psychology
1
300 - Social sciences
4
302 - Social interaction
5
303 - Social processes
1
304 - Factors affecting social behavior
1
307 - Communities
1
330 - Economics
8
331 - Labor economics
22
332 - Financial economics
1
333 - Economics of land & energy
1
338 - Production
9
339 - Macroeconomics & related topics
1
343 - Military, tax, trade & industrial law
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
380 - Commerce, communications & transportation
2
381 - Commerce
1
384 - Communications; telecommunication
10
500 - Natural sciences & mathematics
32
510 - Mathematics
13
519 - Probabilities & applied mathematics
2
600 - Technology
1
608 - Inventions & patents
1
620 - Engineering & allied operations
263
621 - Applied physics
6
624 - Civil engineering
1
625 - Engineering of railroads & roads
2
628 - Sanitary & municipal engineering
1
629 - Other branches of engineering
102
650 - Management & auxiliary services
1
658 - General management
18
670 - Manufacturing
6
741 - Drawing & drawings
1
745 - Decorative arts
48
781 - General principles & musical forms
4
790 - Recreational & performing arts
17
800 - Literature & rhetoric
2
808 - Rhetoric & collections of literature
3