Soon it will be census time again.
Here is a Clearfield review of a great book about the U.S. Census that is owned by the Glenview Public Library. You can see it at R911.73 THO GENEALOGY
Map Guide to the U.S. Federal Censuses, 1790-1920 by William Thorndale and William dollarhide.
Genealogical research in U.S. censuses begins with identifying correct county jurisdictions to assist in this identification, the map Guide shows all U.S. county boundaries from 1790 to 1920. On each of the nearly 400 maps the old county lines are superimposed over the modern ones to highlight the boundary changes at ten-year intervals. Accompanying each map are explanations of boundary changes, notes about the census, tocality finding keys. In addition, there are inset maps which clarify territorial lines, a state-by-state bibliography of sources, an appendix outlining pitfalls in mapping county boundaries. Finally, there is an index which lists all present day counties, plus nearly all defunct counties or counties later renamed-the most complete list of American counties ever published.
Here is a fuller review at the publisher's web site.