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                        Diagram showing the relation between the death-rate from small-pox and the proportion, of population protected
                                                                  by vaccination in each district of the United Provinces.

[NLS note: a graphic appears here - see image of page]

            The black lines and figures indicate proportion of population protected by vaccination during the year 1911-12, and the six years preceding it.
            The red lines and figures indicate the death-rate from small-pox during 1911.

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