Proof positive : this chart tells how your most vital food is made safe : read what the figures mean / Co-operative Union Ltd.

  • Co-operative Union Ltd.
Date:
[between 1930 and 1939?]

Licence: In copyright

Credit: Proof positive : this chart tells how your most vital food is made safe : read what the figures mean / Co-operative Union Ltd. Source: Wellcome Collection.

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