Washington health rules : a commentary on the twelve health rules formulated and distributed by the Association for the Prevention of Tuberculosis of the District of Columbia, a collection of chapters dealing with the essentials of hygiene and adapted for school teachers and for normal school pupils, 1915.

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Washington health rules : a commentary on the twelve health rules formulated and distributed by the Association for the Prevention of Tuberculosis of the District of Columbia, a collection of chapters dealing with the essentials of hygiene and adapted for school teachers and for normal school pupils, 1915. Public Domain Mark. Source: Wellcome Collection.