- 2 Irrigation systems
- 8 Irvine, William
- 5 Irving Street
- 3 Irving, Washington, 1783-1859
- 1 Irwin, Pennsylvania
- 1 Irwin, William Planing Mill
- 1 Isaac (Biblical Patriarch)
- 4 Isaac (Biblical patriarch)
- 3 Isaeus & Jacobsson (Firm)
- 11 Isaiah (Biblical prophet)
- 3 Isfandiya?r (Legendary character)
- 1 Isidore Levy (Firm)
- 73 Islam
- 1 Islamic (culture or style)
- 257 Islamic manuscripts and books
- 6 Island Avenue
- 4 Island Road
- 1 Island Road
- 1 Island Road
- 11 Islands
- 7 Isle of Wight, England
- 2 Isma??i?l I, Shah of Iran, 1487-1524
- 1 Ispahs?l?r
- 2 Israelites
- 3 Israelites to Religious Liberty
- 1 Italian (language)
- 1 Italian boy and monkey (Sculpture)
- 1 Italian Villa Style
- 10 Italianate
- 49 Italy
- 1 Item (Philadelphia, Pa. : Daily)
- 2 Ivins, Dietz & Magee
- 1 Ivins, Dietz and Metzger Co.
- 1 Ivison, Blakeman, Taylor & Co.
- 4 Ivory carving
- 12 Ivy Hill, Pennsylvania
- 1 Izu-nagaoka, Japan
- 1 J & C Price & Bros.
- 1 J. & P. Coats
- 1 J. & R. Morley
