The history of the Mississippi River in 24 powerpoint slides, perfect for classroom use.
Also of interest:
All about Alaska and Hawaii PowerPoint
All about Houston PowerPoint
The Lighthouses of North Carolina PowerPoint
The Erie Canal PowerPoint
National Wildlife Refuge System
History of the Everglades for Kids
Yosemite National Park PowerPoint
History of Los Angeles for Kids
Carlsbad Caverns PowerPoint
Lake Champlain and the Finger Lakes Powerpoint
History of Death Valley for Kids
History of the Missouri River PowerPoint
The Lighthouses of California PowerPoint
The Lighthouses of Oregon PowerPoint
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