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- Herat
- Herbart, Johann Friedrich
- Herbert, George
- Herbert, Victor
- Herculaneum
- Hercules
- Hercules, Pillars of
- Herder, Johann Gottfried von
- Here
- Heredity
- Herkimer, Nicholas
- Hermes
- Hermit
- Hermon, Mt.
- Hero and Leander
- Herod Agrippa I
- Herod the Great
- Herodotus
- Heron
- Herrick, Robert
- Herring
- Herschel, Sir Frederick William
- Herschel, Sir John Frederick William
- Hertz, Heinrich Rudolf
- Hervey Islands
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- Hesiod
- Hesperides
- Hesse
- Hessian Fly
- Hestia
- Heterocyst
- Heterogamy
- Heterospory
- Hewlett, Marice Henry
- Hezekiah
- Hiawatha
- Hibernation
- Hickory
- Hicks-Beach, Rt. Hon. Sir Michael Edwards
- Hicksites
- Hides
- Hieroglyphics
- Higginson, Thomas Wentworth
- Hildreth, Richard
- Hill, Ambrose Powell
- Hill, Benjamin Harvey
- Hill, Daniel Harvey
- Hill, James Jerome
- Hillsboro, Texas
- Hillis, Newell Dwight
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- Himalaya
- Hincks, Sir Francis
- Hindu-Kush
- Hindustan
- Hippias
- Hippocrates
- Hippodrome
- Hippopotamus
- Hirsch, Maurice Baron de
- History, Teaching of
- Hoang-Ho
- Hoar, Ebenezer Rockwood
- Hoar, George Frisbie
- Hobart, Garret Augustus
- Hobbema, Meindert
- Hoboken
- Hobson's Choice
- Hochkirch
- Hog
- Hogarth, William
- Hohenlinden
- Hohenlohe, Prince Clodwig Karl Victor
- Hohenzollern, House of
- Holbein, Hans
- Holland
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