Zone II Environmental Sanitation Seminar - Rural Water Supplies. Singapore, 2-19 December 1957 : final report
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World Health Organization. Regional Office for the Western Pacific. (1957). Zone II Environmental Sanitation Seminar - Rural Water Supplies. Singapore, 2-19 December 1957 : final report. WHO Regional Office for the Western Pacific. https://iris.who.int/handle/10665/208521