MeLCat is a program administered through the Library of Michigan in cooperation with libraries all across Michigan. Chances are if LTU Library doesn't have what you are looking for a participating MeL Library will. The service is free and takes about 1 week.
If you can't find a book at LTU Library or MelCat, WorldCat provides another option for either Interlibrary Loan or to find the book at a nearby library.
Use the Library's Catalog TechCat to look for books.
See the following PowerPoint presentation for searching assistance.