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Unusual rock: serpentine
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Unusual plants: depend on serpentine
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Convio Cares Day at the Presidio
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Convio Cares Day at the Presidio
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Rattklesnake grass, an invasive weed
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The Presidio as seen from the Marin Headlands
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The Presidio as seen from the Marin Headlands
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Rodeo Beach in background, from Point Bonita
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Rodeo Beach in the Marin Headlands