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(361 classifications)

4-Am An-As At-Bi Bl-Ca Cc-Co Cp-Di Dn-El Em-Fa Fe-Fr Fs-Gr Gu-Hu Hy-In Io-La Le-Ma Mc-Mo Mp-Ne Ng-Pa Pd-Po Pr-Ra Rc-Sa Sc-Sl Sm-St Su-Ti To-Un Up-We Wh-Zo

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Guadalupe Mountains (N.M. and Tex.) (1)
Guam (1)
Guatemala (7)
Guerrillas (1)
Guidance systems (Flight). (1)
Guided missiles (1)
Guitar (4)
Guitarists (1)
Gulf Coast (La.) (1)
Gulf of Maine Research Institute (Portland, Me.) (1)
Gullah dialect (1)
Gun control (9)
Gutenberg Bible (2)
Guthrie, Woody, 1912-1967. (1)
Guttiferae (2)
Gymnosperms (2)
Gynecology (1)
Gypsy moth (1)
Gyroscopes. (1)
Habibie, B. J. (Bacharuddin Jusuf), 1936- (1)
Habitat (Ecology) (11)
Habitat conservation (12)
Habitat for Humanity International, Inc. (1)
Hadamard matrices. (1)
Hadrian's Wall (England). (1)
Haiku. (1)
Hairdressing (1)
Haiti Earthquake, Haiti, 2010 (1)
Halberstam, David (1)
Hale-Bopp Comet (1)
Hallgrimsson, Jonas, 1807-1845 (1)
Halloween (6)
Halloween decorations (1)
Halloween Nor'easter, 1991 (1)
Halsema, James J. (1)
Hamilton, Alexander, 1757-1804 (1)
Hampton Roads Naval Museum (1)
Hand pumps. (1)
Handbooks in Economics (1)
Handel, George Frideric, 1685-1759 (2)
Handicapped children (1)
Handicraft (7)
Hanna, William, 1910- (1)
Hanukkah (2)
Hanvey, Bobbie, 1945- (1)
Haplochromis (1)
Haploidy (1)
Happiness (6)
Haptics (1)
Harappa Site (Pakistan) (1)
Hard disk management (3)
Hard disks (Computer science) (7)
Harding, John Wesley (1)
Harding, Warren G. (Warren Gamaliel), 1865-1923 (1)
Harlem (New York, N.Y.) (5)
Harlem Renaissance. (4)
Harmonic analysis (2)
Harpers Ferry (W. Va.) (1)
Harris, Alex, 1949- (1)
Harrisburg (Pa.) (1)
Harrison, George, 1943- (1)
Harry Ransom Humanities Research Center (1)
Hartman, Carl Vilhelm, 1862-1941 (1)
Harvard Business School Press (2)
Harvard Institute for International Development (1)
Harvard Law School (1)
Harvard Medical School. Center for Health and the Global Environment (1)
Harvard Stem Cell Institute (1)
Harvard University (4)
Harvesting machinery (1)
Harvey Cushing/John Hay Whitney Medical Library (1)
Hate crimes (4)
Hawaii (16)
Hawking, S. W. (Stephen W.) (2)
Hawthorne, Nathaniel, 1804-1864 (2)
Hayes, Rutherford Birchard, 1822-1893 (2)
Hazard mitigation (1)
Hazardous geographic environments (1)
Hazardous substances (32)
Hazardous waste site remediation (12)
Hazardous waste sites (16)
Hazardous wastes (13)
Headache (1)
Heads of state (5)
Health (151)
Health and race (7)
Health attitudes (2)
Health behavior in adolescence (4)
Health care reform (9)
Health education (34)
Health education of women. (4)
Health facilities (11)
Health in motion pictures (1)
Health information resources (14)
Health insurance (2)
Health maintenance organizations (2)
Health occupations schools (2)
Health planning (2)
Health policy (12)
Health products (1)
Health promotion (17)
Health risk assessment (5)
Health services accessibility (3)
Health status indicators (10)
Health surveys (10)
Hearing (4)
Hearing impaired (2)
Heart (37)
Heart Mountain (Wyo.) (1)
Heart Transplantation (1)
Heart-Assist Devices (1)
Heat (2)
Heating and ventilation industry (1)
Heating. (1)
Heavy metal (Music) (1)
Hebrew language (1)
Hebrew literature (1)
Hegel, Georg Wilhelm Friedrich, 1770-1831 (2)
Heifers (1)
Heiskell, Andrew, 1915- (1)
Helguera, J. León (1)
Helioseismology (1)
Heliosphere (Astrophysics). (2)
Helminths (1)
Help-wanted advertising (1)
Hematology (3)
Hemingway, Ernest, 1899-1961 (5)
Hemoglobin (1)
Henry Ford Museum and Greenfield Village (1)
Hepatitis C (1)
Heracleion (Extinct city) (1)
Heraldry (1)
Herb gardening (4)
Herbals (2)
Herbaria (11)
Herbicides (3)
Herbs (10)
Heredity (2)
Heredity, Human (2)
Heritage Foundation (Washington, D.C.) (1)
Heritage tourism (2)
Herpetologists (5)
Herpetology (14)
Herrmann, Bernard, 1911-1975 (1)
Heterocyclic compounds (1)
Heyerdahl, Thor. (1)
Hibernation (4)
Hiding places (1)
Higgins, John Woodman, 1874-1951 (1)
Higginson, Thomas Wentworth, 1823-1911 (5)
Higgs bosons (2)
High energy physics (3)
High performance computing (31)
High Plains Aquifer (1)
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High schools (4)
High speed trains (3)
High technology (17)
High technology and education (14)
High technology industries (13)
High temperature superconductivity (1)
Higher education and state (3)
Highlands (Scotland) (4)
Highway engineering (8)
Hijacking of aircraft (1)
Hiking (5)
Himalaya Mountains (1)
Hindenburg (Airship) (2)
Hindi newspapers (1)
Hindu art (3)
Hinduism (4)
Hine, Lewis Wickes, -- 1874-1940 (1)
Hip-hop (2)
Hippies (1)
Hippopotamus (2)
Hirshhorn Museum and Sculpture Garden (3)
Hirst, Damien (2)
Hispanic American art (1)
Hispanic American artists (1)
Hispanic Americans (40)
Hispanic Heritage Month (1)
Hiss, Alger. (2)
Histology (3)
Histology, Pathological (1)
Historians (4)
Historic American Buildings Survey (3)
Historic American Engineering Record (2)
Historic buildings (40)
Historic buildings -- Georgia. (1)
Historic preservation (44)
Historic ships (4)
Historic sites (64)
Historical fiction, American (1)
Historical films and video (15)
Historical geography (23)
Historical geology (11)
Historical libraries (1)
Historical museums (12)
Historical Society of Pennsylvania. (1)
Historiography (2)
History (135)
History of Medicine (4)
History, 20th Century (3)
History, Ancient (21)
History, Modern (5)
Hitler, Adolf, 1889-1945 (1)
HIV (Viruses) (2)
HIV infections (29)
HIV-positive persons (10)
Hmong Americans (2)
Hockey (5)
Hogarth, William, 1697-1764. (2)
Hohenberger, Frank Michael, 1876-1963 (1)
Holī (Hindu festival) (1)
Holiday cookery (8)
Holiday, Billie, -- 1915-1959 (1)
Holidays (14)
Holistic medicine (1)
Holmes, Oliver Wendell, -- 1841-1935 (1)
Holmes, Sherlock (Fictitious character) (2)
Holocaust denial (2)
Holocaust survivors (13)
Holocaust victims (1)
Holocaust, Jewish (1939-1945) (93)
Holocaust, Jewish (1939-1945), and the arts (1)
Holothuroidea (Sea cucumbers) (1)
Homar, Lorenzo (1)
Home automation (2)
Home economics (10)
Home improvement. (3)
Home labor (1)
Home Owners’ Loan Corporation (1)
Home ownership (7)
Home rule (3)
Home schooling (1)
Home video systems (1)
Home-based businesses (2)
Homeless persons (14)
Homelessness (17)
Homeowners (5)
Homer (1)
Homework (2)
Homicide (6)
Homosexuality (4)
Homosexuality and education (1)
Honey (2)
Honeybee (3)
Hong Kong (China) (2)
Hoofs (1)
Hoover Dam (Ariz. and Nev.) (3)
Hoover Institution on War, Revolution, and Peace (2)
Hoover, Herbert, 1874-1964 (1)
Hope, Bob, 1903-. (2)
Hopkins, Gerard Manley, 1844-1889. (1)
Hopper, Edward, 1882-1967 (2)
Hormones (8)
Hormones, Sex (1)
Horne, Lena (1)
Horology (7)
Horror (1)
Horror films. (1)
Horse Genome Project (1)
Horsemanship (2)
Horses (4)
Horticulture (31)
Horticulturists (1)
Horydczak, Theodor, ca. 1890-1971 (1)
Hospice care (1)
Hospital for Sick Children (London, England) (2)
Hospital records (1)
Hospital utilization (3)
Hospitals (18)
Host-parasite relationship (2)
Hot air balloons (1)
Hot springs (5)
Hotel management (1)
Hotels (4)
Houdini, Harry, 1874-1926 (2)
Hours (Time) (2)
Hours of Catherine of Cleves (1)
Hours of labor (5)
House buying (5)
House cleaning (1)
House plants. (2)
House selling (1)
Household surveys (3)
Households (4)
Housekeeping (1)
Housing (73)
Housing policy (15)
Housing rehabilitation (1)
Housing subsidies (5)
Housing, Single family (4)
Houston (Tex.) (4)
Houston, Sam, -- 1793-1863 (1)
HTML (Document markup language) (30)
HTML editors (Computer programs) (3)
Hubble Space Telescope (Spacecraft) (21)
Hudson Motor Car Company (1)
Hudson River school of landscape painting (1)
Hudson's Bay Company (1)
Hughes, Howard, 1905-1976 (1)
Hull-House (Chicago, Ill.). (1)
Human anatomy (46)
Human behavior (8)
Human beings (4)
Human beings—Origin (1)
Human biology (13)
Human capital (3)
Human chromosome abnormalities. (1)
Human chromosomes (4)
Human cloning. (6)
Human computation (1)
Human dissection. (2)
Human ecology (21)
Human engineering. (2)
Human evolution (18)
Human face recognition (Computer science) (5)
Human factors. (1)
Human gene mapping (12)
Human genetics (67)
Human genome (49)
Human Genome Project (7)
Human geography (5)
Human locomotion (1)
Human physiology (16)
Human remains (Archaeology) (7)
Human reproduction (3)
Human reproductive technology (2)
Human rights (117)
Human rights advocacy (31)
Human rights movements (2)
Human rights workers (1)
Human security (1)
Human services (19)
Human settlements (1)
Human sexuality (5)
Human skeleton (4)
Human trafficking (10)
Human-alien encounters in literature (1)
Human-animal relationships (3)
Human-computer interaction (15)
Human-machine systems. (2)
Humanism (1)
Humanitarian assistance (11)
Humanitarianism (3)
Humanities (87)
Humidity (3)
Hummingbirds (14)
Humor research. (1)
Humphrey-Hawkins Full Employment and Balanced Growth Act (1)
Hunger (7)
Hunting (1)
Hunting surveys (1)
Hurricane George, 1998 (1)
Hurricane Katrina, 2005 (13)
Hurricanes (42)
Hurston, Zora Neale (2)
Husband and wife (1)