Let's Have Clean Water [Kit]

Kit issued by the U.S. National Bureau of Standards containing materials regarding conversion to the metric system of measurement. The kit includes a letter of introduction; an order form; two plastic cards printed with rulers and conversion information; and four booklets that discuss how the metric system is different from the English system of measurement, why America should switch, and reference materials for converting.
Date: 1953~
Creator: United States. Public Health Service.
System: The UNT Digital Library