Classification
900 - History & geography
11
170 - Ethics
8
300 - Social sciences
8
330 - Economics
8
200 - Religion
5
301 - Sociology & anthropology
5
306 - Culture & institutions
3
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
320 - Political science
2
380 - Commerce, communications & transportation
2
512 - Algebra
2
880 - Hellenic literatures; classical Greek
2
230 - Christianity & Christian theology
1
270 - History of Christianity & Christian church
1
303 - Social processes
1
305 - Social groups
1
307 - Communities
1
324 - The political process
1
327 - International relations
1
331 - Labor economics
1
337 - International economics
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
369 - Miscellaneous kinds of associations
1
370 - Education
1
371 - Schools & their activities; special education
1
378 - Higher education
1
398 - Folklore
1
410 - Linguistics
1
530 - Physics
1
621 - Applied physics
1
629 - Other branches of engineering
1
700 - The arts; fine & decorative arts
1
800 - Literature & rhetoric
1
820 - English & Old English literatures
1
870 - Italic literatures; Latin literature
1
895 - Literatures of East & Southeast Asia
1
930 - History of ancient world to ca. 499
1
941 - British Isles
1
944 - France & Monaco
1
974 - Northeastern United States
1