Potter, Stephen. cn The magic number : the story of "57" / by Stephen Potter ; with illustrations by David Knight.

Potter, Stephen. cn

The magic number : the story of "57" / by Stephen Potter ; with illustrations by David Knight.

London : M. Reinhardt, 1959.

Includes index.

H.J. Heinz Company.

Food industry and trade -- Pennsylvania -- Pittsburgh.

Condiments.

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