- Holland
- Holly
- Hollyhock
- Holmes, Oliver Wendell
- Holmes, Oliver Wendell, Jr.
- Holst, Hermann Eduard von
- Holy Alliance
- Holy Roman Empire
- Holyoke, Mass.
- Holyoke, Mt.
- Homeopathy
- Homer
- Homer, Winslow
- Homestead Laws
- Homestead, Pa.
- Home, Sweet Home
- Homospory
- Honduras
- Honduras, British
- Honey
- Honeysuckle
- Hong-Kong
- Honolulu
- Hood, John Bell
- Hood, Robin
- Hood, Thomas
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- Hooker, Joseph
- Hooker, Thomas
- Hooke's Law
- Hoosac Tunnel
- Hop
- Hopkins, Johns
- Hopkins, Johns, University
- Hopkins, Mark
- Horace, Quintus Horatius Flaccus
- Horatius
- Horeb, Mt.
- Horn
- Horned Toad
- Hornell, N. Y.
- Hornet
- Horse
- Horse Chestnut
- Horticulture
- Hosea
- Hosmer, Harriet
- Hospitals
- Hotbed and Cold-Frame
- Hotel
- Hot Springs
- Hotspur, Harry
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- Hottentots
- Hourglass
- Housatonic River
- House-Pets
- House-Plants
- Houston
- Houston, Sam
- Howard, John
- Howard, Oliver Otis
- Howe, Elias
- Howe, Julia Ward
- Howells, William Dean
- Howitt, William and Mary
- Huber, François
- Huckleberry
- Huddersfield
- Hudson Bay
- Hudson Bay Company
- Hudson, Henry
- Hudson, N. Y.
- Hudson River
- Hué
- Hughes, Charles Evans
- Hughes, James Laughlin
- Hughes, Thomas
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- Hugo, Victor Marie
- Huguenots
- Huguenots, Les
- Hull (Quebec)
- Hull (England)
- Hull, Isaac
- Hull, William
- Humbert I
- Humboldt, Friedrich Heinrich Alexander, Baron von
- Humboldt, Karl Wilhelm von
- Humboldt River
- Hume, David
- Humming Birds
- Humphreys, Andrew Atkinson
- Humus
- Hundred Years War
- Huns
- Hunt, Helen
- Hunt, James Henry Leigh
- Hunt, Richard Morris
- Hunt, William Holman
- Hunt, William Morris
- Hunter, David
- Hunter, John
- Huntington, Ind.
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