500 Natural Science - 510 - Math (algebra, geometry)
- 520 - Astronomy
- 530 - Physics (light, heat, motion, electricity, magnetism, mechanics)
- 540 - Chemistry
- 550 - Earth Sciences (geology, hydrology, meteorology)
- 560 - Paleontology & Paleozoology (fossils, dinosaurs)
- 570 - Life Sciences (human races)
- 580 - Botany (Plants)
- 590 - Zoology (Animals)
| 600 - Applied Science- 610 - Medicine (health, human body)
- 620 - Engineering (wood, masonry, ceramic, metals)
- 630 - Agriculture (gardening, forestry, animal husbandry)
- 640 - Home economics (cooking, sewing)
- 660 - Chemical engineering (beverages, food, cleaning, explosives, etc.)
- 670 - Manufacturing (iron, leather, textiles)
- 680 - Manufacture for specific uses (hardware, clothing, furnishings, etc.)
- 690 - Buildings(construction, heating, details finishing, etc.)
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