600	Technology (Applied sciences)
601	Philosophy & theory
602	Miscellany
603	Dictionaries & encyclopedias
604	Special topics
605	Serial publications
606	Organizations
607	Education, research, related topics
608	Invention & patents
609	Historical, areas, persons treatment
610	Medical sciences Medicine
611	Human anatomy, cytology, histology
612	Human physiology
613	Promotion of health
614	Incidence & prevention of disease
615	Pharmacology &theraputics
616	Diseases
617	Surgery & related medical specialities
618	Gynecology & other medical specialities
619	Experimental medicine
620	Engineering & allied operations
621	Applied physics
622	Mining & related operations
623	Military & nautical engineering
624	Civil engineering
625	Engineering of railroads, roads
626	Not assigned or no longer used
627	Hydraulic engineering
628	Sanitary & municipal engineering
629	Other branches of engineering
630	Agriculture
631	Techniques, equipment, materials
632	Plant injuries, diseases, pests
633	Field & plantation crops
634	Orchards, fruits, forestry
635	Garden crops (Horticulture)
636	Animal husbandry
637	Processing dairy & related products
638	Insect culture
639	Hunting, fishing, conservation
640	Home economics & family living
641	Food & drink
642	Meals & table service
643	Housing & household equipment
644	Household utilities
645	Household furnishings
646	Sewing, clothing, personal living
647	Management of public households
648	Housekeeping
649	Child rearing & home care of sick
650	Management & auxiliary services
651	Office services
652	Processes of written communication
653	Shorthand
654	Not assigned or no longer used
655	Not assigned or no longer used
656	Not assigned or no longer used
657	Accounting
658	General management
659	Advertising & public relations
660	Chemical engineering
661	Industrial chemicals technology
662	Explosives, fuels technology
663	Beverage technology
664	Food technology
665	Industrial oils, fats, waxes, gases
666	Ceramic & allied technologies
667	Cleaning, color, related technologies
668	Technology of other organic products
669	Metallurgy
670	Manufacturing
671	Metalworking & metal products
672	Iron, steel, other iron alloys
673	Nonferrous metals
674	Lumber processing, wood products, cork
675	Leather & fur processing
676	Pulp & paper technology
677	Textiles
678	Elastomers & elastomer products
679	Other products of specific materials
680	Manufacture for specific uses
681	Precision instruments & other devices
682	Small forge work (Blacksmithing)
683	Hardware & household appliances
684	Furnishings & home workshops
685	Leather, fur, related products
686	Printing & related activities
687	Clothing
688	Other final products & packaging
689	Not assigned or no longer used
690	Buildings
691	Building materials
692	Auxiliary construction practices
693	Specific materials & purposes
694	Wood construction Carpentry
695	Roof covering
696	Utilities
697	Heating, ventilating, air-conditioning
698	Detail finishing
699	Not assigned or no longer used

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