MAUREEN CAVANAUGH (Host): San Diego is known for many things, from Navy homeport to biotech research to avocados. But one thing that does not automatically spring to mind about San Diego is mining, ...
MAUREEN CAVANAUGH (Host): San Diego is known for many things, from Navy homeport to biotech research to avocados. But one thing that does not automatically spring to mind about San Diego is mining, ...
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