There is a book on census maps: "Map Guide to the U.S. Federal Censuses, 1790-1920" by William Thorndale and William Dollarhide. Copyright 1987 I do not have the whole book. A friend copied the pages of several states that I've been researching. Do think that I have seen it at my public library where I research since. Will look for it next chance I have to go. I also want to say that I have seen it advertised in Everton's GEN HELPER. This is a marvelous research tool. Each state has a page map for each census. Each state is in same section. Each year gives notes of county boundary changes during past 10 years. Also has notes on each census year about problems with census, like lost counties, etc. Each map is a state map showing all counties that were counties for that census year. Not sure exactly how big the book is - the TN section that I am looking at is p.314-323. Will try to find out more about it. Sharon S