Classification
900 - History & geography
164
340 - Law
79
370 - Education
31
972 - Middle America; Mexico
24
100 - Philosophy & psychology
20
700 - The arts; fine & decorative arts
18
320 - Political science
15
140 - Specific philosophical schools
8
327 - International relations
8
330 - Economics
8
720 - Architecture
7
000 - Computer science, information & general works
6
576 - Genetics & evolution
6
200 - Religion
5
338 - Production
4
380 - Commerce, communications & transportation
4
610 - Medicine & health
4
304 - Factors affecting social behavior
3
780 - Music
3
800 - Literature & rhetoric
3
300 - Social sciences
2
301 - Sociology & anthropology
2
305 - Social groups
2
336 - Public finance
2
410 - Linguistics
2
500 - Natural sciences & mathematics
2
509 - Historical, geographic & persons treatment
2
600 - Technology
2
782 - Vocal music
2
016 - Bibliographies of works on specific subjects
1
282 - Roman Catholic Church
1
306 - Culture & institutions
1
332 - Financial economics
1
354 - Administration of economy & environment
1
381 - Commerce
1
520 - Astronomy & allied sciences
1
580 - Plants (Botany)
1
615 - Pharmacology & therapeutics
1
641 - Food & drink
1
910 - Geography & travel
1
920 - Biography, genealogy & insignia
1
951 - China & adjacent areas
1
980 - History of South America
1