600

Technology (Applied sciences)

650

Management and Auxiliary Services

601

Philosophy and theory

651

Office services

602

Miscellany

652

Processes of written communication

603

Dictionaries and encyclopedias

653

Shorthand

604

Special topics

654

605

Serial publications

655

606

Organizations

656

607

Education, research, related topics

657

Accounting

608

Invention and patents

658

General management

609

Historical, areas, persons treatment

659

Advertising and public relations

610

Medical Sciences, Medicine

660

Chemical Engineering

611

Human anatomy, cytology, histology

661

Industrial chemicals technology

612

Human physiology

662

Explosives, fuels technology

613

Promotion of health

663

Beverage technology

614

Incidence and prevention of disease

664

Food technology

615

Pharmacology and therapeutics

665

Industrial oils, fats, waxes, gases

616

Diseases

666

Ceramic and allied technologies

617

Surgery and related medical specialties

667

Cleaning, color, related technologies

618

Gynecology and other medical specialties

668

Technology of other organic products

619

Experimental medicine

669

Metallurgy

620

Engineering and Allied Operations

670

Manufacturing

621

Applied physics

671

Metalworking and metal products

622

Mining and related operations

672

Iron, steel, other iron alloys

623

Military and nautical engineering

673

Nonferrous metals

624

Civil engineering

674

Lumber processing, wood products, cork

625

Engineering of railroads, roads

675

Leather and fur processing

626

676

Pulp and paper technology

627

Hydraulic engineering

677

Textiles

628

Sanitary and municipal engineering

678

Elastomers and elastomer products

629

Other branches of engineering

679

Other products of specific materials

630

Agriculture

680

Manufacture for specific uses

631

Techniques, equipment, materials

681

Precision instruments and other devices

632

Plant injuries, diseases, pests

682

Small forge work (Blacksmithing)

633

Field and plantation crops

683

Hardware and household appliances

634

Orchards, fruits, forestry

684

Furnishings and home workshops

635

Garden crops (Horticulture)

685

Leather, fur, related products

636

Animal husbandry

686

Printing and related activities

637

Processing dairy and related products

687

Clothing

638

Insect culture

688

Other final products and packaging

639

Hunting, fishing, conservation

689

640

Home Economics and Family Living

690

Buildings

641

Food and drink

691

Building materials

642

Meals and table service

692

Auxiliary construction practices

643

Housing and household equipment

693

Specific materials and purposes

644

Household utilities

694

Wood construction, carpentry

645

Household furnishings

695

Roof covering

646

Sewing, clothing, personal living

696

Utilities

647

Management of public households

697

Heating, ventilating, air-conditioning

648

Housekeeping

698

Detail finishing

649

Child rearing and home care of sick

699