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Staffers at the U.S. Census Bureau in Washington
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Staffers at the U.S. Census Bureau in Washington mark up a map for use in the 1940 census. The map shows approximately 147,000 enumeration districts for census-taking purposes and will ensure against overlapping activities of census takers, or enumerators, and also to avoid missing any territory.(Credit: AP/Franklin D. Roosevelt Presidential Library and Museum)

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1940 Census

Details of 132 million people who lived through the 1930s will be disclosed as the U.S. government releases the 1940 census on April 2 to the public for the first time after 72 years of privacy protection lapses.