We have two options for getting a book you need that we don't have in our collection:
First: you can check to see if it is available on the Ann Arbor campus by changing the "Search in" box in the Library Catalog -- linked above -- to "UM-Ann Arbor Libraries." If it is available there, you can request that it be sent here for you to check out using Get This (see link below for more information).
If it's not available in Ann Arbor you can place an Interlibrary Loan request. This means that the book will come from a participating library elsewhere in the United States. A link is provided below with further information and instructions on how to use Interlibrary Loan.