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Natural Resources

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333 Economics of land & energy

500 Science

500 Natural sciences & mathematics

506 Organizations & management

507 Education, research, related topics

508 Natural history

520 Astronomy

520 Astronomy & allied sciences

522 Techniques, procedures, apparatus, equipment, materials

525 Earth (Astronomical geography)

536 Heat

537 Electricity & electronics

538 Magnetism

540 Chemistry & allied sciences

541 Physical chemistry

542 Techniques, procedures, apparatus, equipment, materials

546 Inorganic chemistry

547 Organic chemistry

548 Crystallography

549 Mineralogy

550 Earth sciences & geology

550 Earth sciences

551 Geology, hydrology, meteorology

552 Petrology

553 Economic geology

554 Earth sciences of Europe

555 Earth sciences of Asia

556 Earth sciences of Africa

557 Earth sciences of North America

558 Earth sciences of South America

559 Earth sciences of Australasia, Pacific Ocean islands, Atlantic Ocean islands, Arctic islands, Antarctica, extraterrestrial worlds

560 Fossils & prehistoric life

560 Paleontology

561 Paleobotany; fossil microorganisms

562 Fossil invertebrates

563 Miscellaneous fossil marine & seashore invertebrates

564 Fossil Mollusca & Molluscoidea

565 Fossil Arthropoda

566 Fossil Chordata

567 Fossil cold-blooded vertebrates

568 Fossil Aves (birds)

569 Fossil Mammalia

570 Biology

570 Biology

571 Physiology & related subjects

572 Biochemistry

573 Specific physiological systems in animals, regional histology & physiology in animals

574 Not assigned or no longer used

575 Specific parts of & physiological systems in plants

577 Ecology

578 Natural history of organisms & related subjects

579 Natural history of microorganisms, fungi, algae

580 Plants

580 Plants

581 Specific topics in natural history of plants

582 Plants noted for specific vegetative characteristics and flowers

583 Magnoliopsida (Dicotyledones)

584 Liliopsida (Monocotyledones)

585 Pinophyta (Gymnosperms)

586 Cryptogamia (Seedless plants)

587 Pteridophyta

588 Bryophyta

589 No longer used—formerly Forestry

590 Animals (Zoology)

590 Animals

591 Specific topics in natural history of animals

592 Invertebrates

593 Miscellaneous marine & seashore invertebrates

594 Mollusca & Molluscoidea

595 Arthropoda

596 Chordata

597 Cold-blooded vertebrates

598 Aves (Birds)

599 Mammalia (Mammals)

613.1 Role of the natural environment

622 Mining & related operations

630 Agriculture

630 Agriculture & related technologies

631 Specific techniques; apparatus, 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, related technologies