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The National Archives acquired the master negative microfilm rolls from the Bureau of the Census and could not correct some problems with legibility. Also, some Census Bureau volume pages at the beginning of the schedules may omit or misorder counties, MCDs, or EDs and include other errors that the National Archives did not create but which this catalog reflects. The Soundex, prepared by the Works Progress Administration, and the microfilm produced by the Bureau of the Census may include additional problems. While the National Archives did not have the staff necessary to detect and correct all these problems, researchers who identify any are encouraged to report them to the Publications Branch (NECP), National Archives, Washington, DC 20408.