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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.

                                            The black lines and figures indicate proportion of population protected by vaccination during the year 1916-1917 and the six years preceding it.
                                            The red lines and figures indicate the death-rate from small-pox during 1916.

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