Harbors-See Boats & Boating; Ships & Shipping Hardware-See also Agriculture & Agricultural Supplies; Appliances; Furniture; Home: Furnishings, Entertainment; Gardening & Horticulture; Sports & Sporting Goods
Hats-See Apparel & Accessories Hauling-See Railroads; Traffic & Transportation; Trucking Health & Fitness-See also Drugs & Pharmaceuticals; Hospitals & Nursing Homes; Medicine; Nursing; Psychology; Psychiatry; Sanitation; Social Services & Welfare
Hearing & Speech-See also Deaf; Disability; Education; Health & Fitness; Literature & Linguistics; Medicine; Sound Engineering
Heating; Plumbing; A/C; Refrig.- See also Appliances; Construction & Building; Electric & Electronic Equipment; Hardware; Metals & Metalworking
Hematology-See Medicine Heraldry-See Genealogy Herbariums-See Botany; Gardening & Horticulture Heredity-See Biology; Genealogy; Genetics Hides-See Leather & Leather Goods Higher Education-See College Alumni; College Student Press; College General; Education
Highways-See Construction & Building; Engineering/Civil; Roads & Streets; Traffic & Transportation
Histochemistry-See Biochemistry; Medicine Histology-See Biology; Botany History-See also Archaeology & Paleontology; Folklore; Genealogy; Regional Interest
Hobbies-See also Antiques & Art Goods; Boats & Boating; Collectibles; Crafts; Crossword & Other Puzzles; Cycling-Bicycle & Motor; Sports & Sporting Goods; Hunting & Fishing; Numismatics; Philately & Postal Affairs; Photography
Hockey-See Sports & Sporting Goods
Hogs-See Agriculture & Agricultural Supplies; Feed, Grain & Milling; Livestock
Home Economics-See Consumer Interests; Education; Food & Food Preparation; Home: Furnishings, Entertainment; Nutrition
Home: Furnishings, Entertainment-See also Architecture; Construction & Building; Furniture; Gardening & Horticulture; Heating/Plumbing/A.C./Refrig.; Interior Design & Decoration; Lighting; Real Estate
Home Improvement-See Architecture; Construction & Building; Furniture; Gardening & Horticulture; Heating/Plumbing/A.C./Refrig.; Interior Design & Decoration; Lighting; Real Estate
Homosexual Literature-See Gay & Lesbian Interest Honey-See Agriculture & Agricultural Supplies; Confectionery; Food & Food Preparation; Produce
Hormones-See Drugs & Pharmaceuticals; Medicine Horology-See Jewelry/Clocks & Watches Horses-See also Gambling; Livestock; Veterinary Horror-See Mystery & Horror Horticulture-See Gardening & Horticulture Hosiery-See Apparel & Accessories; Textiles Hospitals & Nursing Homes-See also Dentistry; Drugs & Pharmaceuticals; Health & Fitness; Medicine; Nursing; Restaurants & Catering; Psychiatry; Psychology
Hotel Industry-See also Entertainment; Food & Food Preparation; Restaurants & Catering; Travel
House Organs-See also specific area of interest Household Management-See Home: Furnishings, Entertainment
Housewares-See Appliances; Electric & Electronic Equipment; Furniture; Hardware; Home Entertainment & Home Furnishings
Housing-See Construction & Building; Public Management & Planning; Real Estate
Human Resources-See Industrial Relations/Human Resources Humanities-See Culture & Humanities; Literature & Linguistics; Psychology; Psychiatry; Religion & Theology; Sociology
Humor & Satire-See also Comics; Literary Reviews; Literature & Linguistics; Poetry & Creative Writing
Hunting & Fishing-See also Boats & Boating; Environment & Ecology; Dogs; Sports & Sporting Goods; Outdoors; Parks & Recreation Areas; Regional Interest
Hydrology-See Water Supply, Power & Waste Hygiene-See Health & Fitness Hypnosis-See Dentistry; Medicine; Psychiatry; Psychology
-I-
Ice & Refrigeration-See Heating/Plumbing/A.C./Refrig. Ice Cream-See Confectionery; Dairy; Food & Food Preparation
Ice Skating-See Snow & Ice Sports; Sports & Sporting Goods
Ichthyology-See Biology; Fish & Fisheries; Zoology Immigration-See Law; Political Science & Politics; International Affairs
Immunology-See Biochemistry; Biology; Drugs & Pharmaceuticals; Health & Fitness; Microbiology Imports-See International Trade