A sort of national treasure is scheduled to be revealed Monday: In April 1940, 120,000 census takers spread out across America to take an inventory of its residents. Now that the legally mandated 72 years have passed, we finally get to see the names, addresses, jobs and salaries of all the people who were counted.

This lifting of the veil takes place every 10 years, but William Maury, chief historian at the U.S. Census Bureau, says this census offers some particularly interesting information.

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