Subjects
- Gold mines and mining--California--History--19th century.1
- Gold mining.1
- Guardianship.1
- Hair.1
- Harbors.1
- Health behavior--United States--History--19th century.1
- Historians--United States--20th century.1
- History--Research.1
- Hoisting machinery.1
- Holidays.1
- Homestead Strike, Homestead, Pa., 1892.1
- Hops--Washington (State)1
- Horse railroads.1
- Hotels--Colorado--1900-1910.1
- Hydraulic facilities.1
- Hydroelectric power plants.1
- Hydroelectric power--Colorado--1900-1910.1
- Ice.1
- Inclined railroads.1
- Indians of North America--California--History--19th century.1