Before you start your search, try to compile a list of potential keywords. This is always a good idea, but it is especially useful for conducting searches in a new and interdisciplinary field, such as Native American Studies. A good first place to start is to identify possible culture group names for your search, using an ethnonym index.
Since the UIUC Library is split into several departmental libraries, the items you may be looking for could be held in different places. Use the different tabs in this guide for help finding different types of material; if you need further help, please do not hesitate to contact us via email, instant messenger, or in person.
This page shows a few of the libraries that may have the resources you are looking for. A complete list of the departmental libraries is available online.