I've always wondered what these quarter-sized things embedded in sidewalks are. Anyone know? : r/sandiego

Why missing, busted sidewalks go unfixed in this San Diego area

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prologue - Science & Engineering Library - UC San Diego

I can rationalize iron pin cushions. But X cut pin cushions? : r

37K sidewalk repairs needed in San Diego

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I've always wondered what these quarter-sized things embedded in

What's this graffiti symbol mean? I see them throughout Chicago

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Opinion: San Diegans shouldn't be responsible for sidewalks - The