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551.31 Glaciers 551.57 Clouds 551.58 Deserts 553.6 Earthly economic minerals 575 Evolution 578 Microscopy 580 Botany 581 Physiologic botany 582 Trees 582.13 Flowers 589.95 Bacteriology 590 Zoology. Animal life 591.5 Habits and behavior of animals 591.57 Means of protection 591.92 Marine and fresh-water fauna 593 Elementary animals 593.4 Sponges 593.7 Hydrozoa 594 Mollusks 595.1 Worms 595.3 Crustacea 595.7 Insects 595.73 Termites 595.78 Butterflies 595.79 Bees 597.8 Toads. Frogs. Salamanders 598.1 Reptiles 598.2 Birds 600 Useful arts 606 Expositions 610 Medicine 610.7 Nursing 612 Physiology 612.4 Glands 612.6 Reproduction 613 Hygiene 613.2 Food. Dietetics 613.6 Hygiene of employment 613.7 Physical education and training 613.81 Alcoholism 614 Public health 614.3 Food inspection 614.4 Infectious diseases 614.8 Safety. Coast guard 614.84 Fire protection and prevention 616.2 Diseases of the respiratory system 616.24 Tuberculosis 616.6 Diabetes 616.9 General diseases 617.6 Dentistry. Care of the teeth 617.7 Care of the eyes 617.8 Care of the ears 618 Maternity 619 Diseases of animals 620 Engineering 621.384 Radio 621.385 Telephone 621.388 Television 621.4 Gas and oil engines 621.8 Principles of mechanism 621.89 Lubrication 621.9 Machine tools 621.92 Grinding 622.34 Gold mining 623.8 Naval architecture 624 Bridges 625 Tunnels 625.7 Roads. Highways 626 Irrigation 627.8 628.1 628.3 629.13 629.2 629.213 629.22 630 630.1 630.941 630.942 630.951 630.952 630.9729 630.973 631.1 631.18 631.3 631.4 631.8 632.4 632.7 633.1 633.2 633.3 634.1 634.3 634.9 634.92 635 635.9 636 636.1 636.2 636.3 636.4 636.5 636.7 636.8 636.9 637 640 641 641.3 641.5 642 646 647.1 647.9 649 651 652 655 655.32 658 658.8 660 662 662.6 663 664 664.1 664.9 665.1 665.5 666.1 668.4 669.1 669.3 669.4 669.7 30 Dams Water supply engineering Sewage disposal Aeronautics Automobiles Safe driving Bicycles Agriculture Farm life Agriculture in Scotland Agriculture in England Agriculture in China Agriculture in Japan Agriculture in Cuba Agriculture in the United States Farm economics Marketing of farm produce Farm machinery Soils Fertilizers Fungous diseases of grain Injurious insects Cereals. Grains Forage crops Beans Apples. Pears Citrus fruits Forestry Forest fires Gardening Flower gardening Domestic animals _._ Horses Cattle Goats. Sheep Swine Poultry Dogs Cats Fur-bearing animals Dairy and dairy products Home economics Food Meat Cookery Carving Clothing Household accounting Hotels Care of children Office management Typewriting Printing Methods Business Salesmanship Chemical technology Matches Coal Beverages Foods Sugar Packing industry Candles Petroleum Glass Plastic materials Mettallurgy of iron and steel Copper Lead Aluminum. Nickel