If you discover the Library does not own the book you need, you can request the book through the library's Interlibrary Loan service.
Interlibrary loan, often regarded as ILL or ILS and also known as interlending, document delivery, document supply, or interlibrary services, is a service that allows users of one library to borrow items from another and obtain photocopies of documents that are owned by a different library. The user submits a request to a library, which locates other libraries that have the item they're looking for, places the request, gets the item, gives it to the user, and makes arrangements for its return. Interlibrary borrowing programs may come with costs.
In order to borrow original, photocopied, or scanned items, a borrowing library contacts an owning library on behalf of its user. When a request cannot be fulfilled, the owner library provides a justification or sends the requested resources to the borrowing library.
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