The Centennia Atlas
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The Centennia Historical Atlas software runs under Apple Macintosh OS X (Mavericks, Mountain Lion, etc.), as well as Microsoft Windows (Windows 8, 7, Vista, etc.). The software requires 20 megabytes of hard disk space and 40 megabytes of memory. Centennia does not have any other significant system requirements, and it will run well on almost any computer manaufactured in the past ten years.
The files available for download here include all text and map data covering ten centuries of European and Mid East history. The French Revolutionary and Napoleonic Period (1789-1819) is available at no cost. To access the full time period, you will need to purchase an access code.
Note: if you get a security warning, option-click on the file and then select 'Open' from the sub-menu.