The book details population changes in every region of the planet from 400 BC to 1978 AD. McEvedy and Jones used seventy line graphs and accompanying commentary text to describe population changes in seventy regions. The only negative aspect of this book is that the authors estimates of pre-European, Native American populations are considerably lower than most other estimates and seem somewhat outdated. While many books describe population changes, few cover such a huge breadth of space and time and few give so much information so directly. This book is much appreciated and other books like this would certainly be welcome.