Não informado. (1906). Public Health. Department of Health.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Public Health. Lansing, Mich: Department of Health, 1906.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Public Health. Department of Health, 1906.
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