File:Shellmounds of the San Francisco Bay Region.pdf
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![File:Shellmounds of the San Francisco Bay Region.pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/9/92/Shellmounds_of_the_San_Francisco_Bay_Region.pdf/page1-388px-Shellmounds_of_the_San_Francisco_Bay_Region.pdf.jpg?20190618201626)
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