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If a book is not available at the USD Libraries you have two options: Request your book from the Circuit (the combined catalog for USD, SDSU, UCSD, CSU San Marcos and San Diego County Public Libraries). If you find the book you need in the Circuit you can simply make an online request and have the book delivered to Copley Library. If the book is not available through the Circuit, use our Interlibrary loan Book Request Form. The library's Interlibrary Loan Department will borrow your book from participating libraries worldwide.