Haven't seen this advertisement but the location is familiar. There is a company in Bath OH that has preyed on families and would-be genealogists for years. Most of their books are gleaned from phone books - basically a listing of all the "surname" in the phone books from around the country. A couple of years ago I received a notice that had a new twist - supposably an index of all the "surname" in the US Censuses. This might have been useful, but not enough to get me to release my $. Maybe the title "World Book" indicates that their listing extends outside the US. Bottom line: This is one of those ads that should bear the title "Let the Buyer Beware" Good Luck Mark