615 Materia medica and therapeutics.
616 Pathology, theory and practice.
617 Surgery and dentistry.
618 Obstetrics and sexual science.
619 Veterinary medicine.

=620 Engineering.=
621 Mechanical.
622 Topographical.
623 Military.
624 Bridge.
625 Road and railroad.
626 Canal.
627 Harbor.
628 Hydraulic and mining.
629 Instruments and field books.

=630 Agriculture.=
631 Soil and preparation.
632 Pests and hindrances.
633 Productions of the soil.
634 Fruits.
635 Garden.
636 Domestic animals.
637 Dairy.
638 Bees and silkworm.
639 Fishing, trapping.

=640 Domestic Economy.=
641 Cookery.