Classification
320 - Political science
171
330 - Economics
139
333 - Economics of land & energy
89
304 - Factors affecting social behavior
63
610 - Medicine & health
63
370 - Education
54
600 - Technology
38
336 - Public finance
31
363 - Other social problems & services
29
380 - Commerce, communications & transportation
18
630 - Agriculture & related technologies
8
900 - History & geography
4
300 - Social sciences
3
340 - Law
3
972 - Middle America; Mexico
2
140 - Specific philosophical schools
1
160 - Logic
1
321 - Systems of governments & states
1
398 - Folklore
1
400 - Language
1
410 - Linguistics
1
658 - General management
1
700 - The arts; fine & decorative arts
1
800 - Literature & rhetoric
1
973 - United States
1
980 - History of South America
1