In this undated photo provided by the Franklin D. Roosevelt Presidential Library and Museum, 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. (AP Photo/Franklin D. Roosevelt Presidential Library)

Associated Press
In this undated photo provided by the Franklin D. Roosevelt Presidential Library and Museum, 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. (AP Photo/Franklin D. Roosevelt Presidential Library)
In this undated photo provided by the Franklin D. Roosevelt Presidential Library and Museum, 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. (AP Photo/Franklin D. Roosevelt Presidential Library)
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