Map Guide To The U.S. Federal Census by William Dollarhide

This is one of the most popular books ever written on genealogy. The Map Guide shows county outline maps at ten-year intervals, the old county boundaries being superimposed over the modern lines. These maps are designed for historians, genealogists, and demographers who use the name lists and statistics of the censuses, but will help anyone seeking some sense of county boundary changes. The maps begin with 1790, the earliest federal census, and ends with 1920.