Classification
307 - Communities
92
330 - Economics
40
333 - Economics of land & energy
31
320 - Political science
30
710 - Civic & landscape art
29
363 - Other social problems & services
22
711 - Area planning
20
338 - Production
19
300 - Social sciences
18
304 - Factors affecting social behavior
17
340 - Law
14
658 - General management
14
720 - Architecture
14
577 - Ecology
12
500 - Natural sciences & mathematics
7
610 - Medicine & health
7
624 - Civil engineering
6
900 - History & geography
6
551 - Geology, hydrology & meteorology
5
621 - Applied physics
5
629 - Other branches of engineering
5
630 - Agriculture & related technologies
5
001 - Knowledge
4
306 - Culture & institutions
4
700 - The arts; fine & decorative arts
4
140 - Specific philosophical schools
3
380 - Commerce, communications & transportation
3
620 - Engineering & allied operations
3
690 - Buildings
3
745 - Decorative arts
3
910 - Geography & travel
3
000 - Computer science, information & general works
2
004 - Data processing & computer science
2
302 - Social interaction
2
305 - Social groups
2
352 - General considerations of public administration
2
364 - Criminology
2
370 - Education
2
381 - Commerce
2
384 - Communications; telecommunication
2
600 - Technology
2
613 - Personal health & safety
2
006 - Special computer methods
1
153 - Mental processes & intelligence
1
202 - Doctrines
1
301 - Sociology & anthropology
1
309 - [Unassigned]
1
331 - Labor economics
1
334 - Cooperatives
1
344 - Labor, social, education & cultural law
1
more ...