I
- ice cream parlors (2)
- ice industry (3)
- ice skating rinks (1)
- icebreakers (1)
- icehouses (20)
- immigrants (65)
- incinerators (4)
- inclined planes (5)
- Indians of North America (147)
- indigenous peoples (7)
- industrial facilities (103)
- industrial towns (1)
- industrial works (1)
- industry (984)
- infirmaries (5)
- inspection (2)
- institutional care (1)
- insurance (3)
- intakes (5)
- interlocking towers (1)
- international relations (2)
- interpretation (1)
- iron fences (7)
- iron industry (77)
- iron truss bridges (34)
- ironworks (17)
- ironwork (17)
- irrigation canals (42)
- irrigation (45)
- islands (247)