Proposed amendment to appendix 4 of the International Sanitary Regulations (international certificate of vaccination or revaccination against smallpox): submitted by the Delegations of Portugal and the United States of America
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World Health Assembly, 8. (1955). Proposed amendment to appendix 4 of the International Sanitary Regulations (international certificate of vaccination or revaccination against smallpox): submitted by the Delegations of Portugal and the United States of America. World Health Organization. https://iris.who.int/handle/10665/104211