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