Here's a scan of a 1940 Popular Science article on the Census on the "Modern Mechanix" blog. The article looks at the use of a new, modern punch-card system to speed up the incredible task of counting "about 132,000,000 Americans."
Of course, Census fans know that Herman Hollerith actually devised the first practical use the punch cards as well as developing the original tabulating equipment to speed the processing of the Census back in 1890.
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