Under the Dewey Decimal System used in some libraries, the 600 - 700 section is reserved for Technology books, also known as the applied sciences.

Here is a breakdown within the 600s.

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

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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