Internet Archive - protecting water supplies 1954 (1954)

财富辛

Title: Protecting Water Supplies
Source: Internet Archive (Archive.org)

English Introduction:
A 1954 public-health educational short about sanitation risks in water systems and the basics of protecting supplies.

中文标题：
保护供水系统

中文简介：
1954年的公共卫生教育短片，介绍供水系统中的卫生风险与基础防护方法。

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