Listing by Title A-Z
- IEEE All Society Periodicals Package (ASPP) Online and IEEE Proceedings Order Plan (POP) 1998+.
- ILLIad---Interlibrary Loan System
- Illinois APCO Historical Collection 67 years of Governmental and Public-Safety Communications.
- Illinois Sanborn Maps 1867-1970
- Illinois Women Artists Project Sponsored by the Peoria Historical Society and hosted at Bradley University.
- Import Genius Collects and organizes shipping manifests and customs records since 2006 from government agencies and private companies around the world for product shipments into U.S. ports. In addition, it documents shipping in and out of several Latin American countries. Note that searching the documents from Latin American countries by company or product (except for brand names) must be done in Spanish. More information may be found at Import Genius.
- IOPscience Institute of Physics Journals.