The prehistoric clam gardens of the Pacific Northwest, as compared with regular clam beaches, were found to quadruple the production of butter clams. | Harper's Magazine

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The prehistoric clam gardens of the Pacific Northwest, as compared with regular clam beaches, were found to quadruple the production of butter clams.

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The prehistoric clam gardens of the Pacific Northwest, as compared with regular clam beaches, were found to quadruple the production of butter clams.

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