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Course Reserves are materials that are on reserve (by instructor request) for specific courses and available for a limited loan period, usually for 2 hours at a time, to ensure that they're available for as many students as possible.
Interlibrary Loan, often referred to as ILL, can help obtain materials not owned by Purdue Libraries. Visit the ILL website to submit a request or contact them at ill@purdue.edu or (765) 494-2800