The Missing 1840 Census Enumeration . This webinar discusses a couple "missing" from the 1840 Census in Ohio and how they were eventually found and the indirect evidence used. A good overview of using land records to solve a "non-land record" problem with some points along the way about organization and visualization. Suggestions for additional research are also discussed.
You can order the download of "The Missing 1840 Census Enumeration" today (14 May 2013) for $4--via this link