Free Chart: Comparison of Census Information, 1790-1940

A good chart from Ancestry.com [free] displays a comparison of census information, 1790-1940. The chart is on the 1940 Census Wiki page.
Very helpful when trying to determine what census asked questions such as “Month of birth” (don’t we wish that was asked on ALL of them!)
Link: Comparison of Census Information, 1790-1940.