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Western United States - Wikipedia
The West | Definition, States, Map, & History | Britannica
Western United States - New World Encyclopedia
the West - Students | Britannica Kids | Homework Help
Physiographic regions of the United States - Wikipedia
North America: Physical Geography - National Geographic Society
United States Regions - National Geographic Society
Map of Western United States | Mappr
Landforms of the United States | U.S. Geological Survey - USGS.gov
West Coast of the United States - Wikipedia