geography
Get flash to fully experience Pearltrees
cartography
World political boundaries from 2000 BC thru 2008 AD . Use negative years for BC, such as -200 By searching for books above, your purchases can help support this blog's tool development. Thank you! QUICK TIPS FOR USING THIS TOOL: 1. Type a PRESENT-day Place and a HISTORICAL Year as early as 2000 BC, then hit the "Go!"
Historical World Boundary Maps
Electricity Around the World
The table below summarizes information on the electrical systems in use in most countries of the world. The voltages listed here are the "nominal" figures reported to be in use at most residential or commercial sites in the country or area named. Most electrical power systems are prone to slight variations in voltage due to demand or other factors.