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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