1840 US Federal Census, , sixth census of the united states, , ; digital images, (: accessed ); National Archives and Records Administration microfilm, M704, 580 rolls.

• Title	1840 US Federal Census, , sixth census of the united states, , ; digital images, (: accessed ); National Archives and Records Administration microfilm, M704, 580 rolls.
  Short Title	1840 US Federal Census
  Source ID	S7