Classification
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155 - Differential & developmental psychology
2
170 - Ethics
2
337 - International economics
2
361 - Social problems & social welfare in general
2
362 - Social welfare problems & services
2
540 - Chemistry & allied sciences
2
572 - Biochemistry
2
581 - Specific topics in natural history
2
614 - Incidence & prevention of disease
2
617 - Surgery & related medical specialties
2
629 - Other branches of engineering
2
634 - Orchards, fruits & forestry
2
641 - Food & drink
2
650 - Management & auxiliary services
2
664 - Food technology
2
690 - Buildings
2
001 - Knowledge
1
050 - General serial publications
1
153 - Mental processes & intelligence
1
179 - Other ethical norms
1
180 - Ancient, medieval & eastern philosophy
1
327 - International relations
1
341 - Law of nations
1
343 - Military, tax, trade & industrial law
1
351 - Public administration
1
355 - Military science
1
360 - Social problems & services; associations
1
368 - Insurance
1
371 - Schools & their activities; special education
1
410 - Linguistics
1
511 - General principles of mathematics
1
549 - Mineralogy
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
590 - Animals (Zoology)
1
599 - Mammals
1
600 - Technology
1
611 - Human anatomy, cytology & histology
1
615 - Pharmacology & therapeutics
1
623 - Military & nautical engineering
1
636 - Animal husbandry
1
640 - Home & family management
1
745 - Decorative arts
1
809 - History, description & criticism
1
900 - History & geography
1