How libraries share resources
If your library doesn't own something you need or if the material is not available electronically, the Interlibrary Loan Department will try to get it for you from another library. Thousands of public, academic, and special libraries participate in the interlibrary loan system, and can borrow materials from wherever they are located, even from another country.
TIM'S TOUR: One article that Tim really wants is from a journal that his library doesn't own. The reference librarian sends him to the interlibrary loan office to request it. The interlibrary loan staff member tells him they'll get a copy of the article for him within two weeks. He's glad he started his research early.
If it's a book you need, interlibrary loan will borrow the book. If it's an article, they will get a photocopy of the article. Ask at your library about cost.
Interlibrary loan is a wonderful service that gives you access to almost any library in the world but you'll need to give them time to get the materials for you, so plan ahead!