Classification
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001 - Knowledge
3
003 - Systems
3
153 - Mental processes & intelligence
3
170 - Ethics
3
303 - Social processes
3
338 - Production
3
341 - Law of nations
3
346 - Private law
3
417 - Dialectology & historical linguistics
3
500 - Natural sciences & mathematics
3
510 - Mathematics
3
519 - Probabilities & applied mathematics
3
616 - Diseases
3
618 - Gynecology, obstetrics, pediatrics & geriatrics
3
636 - Animal husbandry
3
650 - Management & auxiliary services
3
720 - Architecture
3
809 - History, description & criticism
3
972 - Middle America; Mexico
3
973 - United States
3
004 - Data processing & computer science
2
005 - Computer programming, programs & data
2
120 - Epistemology, causation & humankind
2
121 - Epistemology
2
126 - The self
2
128 - Humankind
2
133 - Specific topics in parapsychology & occultism
2
158 - Applied psychology
2
160 - Logic
2
297 - Islam, Babism & Bahai Faith
2
322 - Relation of state to organized groups
2
327 - International relations
2
361 - Social problems & social welfare in general
2
378 - Higher education
2
394 - General customs
2
415 - Grammar
2
418 - Standard usage & applied linguistics
2
495 - Languages of East & Southeast Asia
2
499 - Austronesian & other languages
2
523 - Specific celestial bodies & phenomena
2
551 - Geology, hydrology & meteorology
2
599 - Mammals
2
660 - Chemical engineering
2
940 - History of Europe
2
950 - History of Asia; Far East
2
959 - Southeast Asia
2
960 - History of Africa
2
979 - Great Basin & Pacific Slope region
2
980 - History of South America
2
994 - Australia
2
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