The San Francisco city controller's biennial survey finds that public libraries get an "A" grade from residents, and parks get a "B+." The worst grades, KCBS Radio's Jenna Lane reports, go to Muni.

<p>The San Francisco city controller's biennial survey finds that public libraries get an "A" grade from residents, and parks get a "B+." The worst grades, KCBS Radio's Jenna Lane reports, go to Muni.</p>

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