Classification
900 - History & geography
114
947 - Eastern Europe; Russia
56
320 - Political science
52
820 - English & Old English literatures
51
306 - Culture & institutions
16
330 - Economics
15
327 - International relations
10
940 - History of Europe
10
576 - Genetics & evolution
9
301 - Sociology & anthropology
8
305 - Social groups
7
370 - Education
6
700 - The arts; fine & decorative arts
5
809 - History, description & criticism
4
200 - Religion
3
333 - Economics of land & energy
3
300 - Social sciences
2
303 - Social processes
2
323 - Civil & political rights
2
338 - Production
2
363 - Other social problems & services
2
400 - Language
2
418 - Standard usage & applied linguistics
2
509 - Historical, geographic & persons treatment
2
520 - Astronomy & allied sciences
2
600 - Technology
2
800 - Literature & rhetoric
2
891 - East Indo-European & Celtic literatures
2
907 - Education, research & related topics
2
909 - World history
2
910 - Geography & travel
2
100 - Philosophy & psychology
1
120 - Epistemology, causation & humankind
1
230 - Christianity & Christian theology
1
281 - Early church & Eastern churches
1
284 - Protestants of Continental origin
1
296 - Judaism
1
304 - Factors affecting social behavior
1
331 - Labor economics
1
337 - International economics
1
340 - Law
1
346 - Private law
1
349 - Law of specific jurisdictions & areas
1
355 - Military science
1
364 - Criminology
1
380 - Commerce, communications & transportation
1
401 - Philosophy & theory
1
407 - Education, research & related topics
1
410 - Linguistics
1
491 - East Indo-European & Celtic languages
1
more ...