If SDCL doesn't own the item, you may place a request via Circuit or Link+ if a copy is available.
The library offers a special service called Interlibrary Loan (or ILL) for books or periodical photocopies not owned by the San Diego County Library, Circuit or Link+. SDCL does not charge for this service. However, the lending libraries may charge a fee.
Ask library staff for more information about this service; they can help you fill out a request.