Here are some links to get your some headstart for Little House on The Prairie...
Historic Native Americans : The Osage Indians
Missouri History: Osage Indians
Osage Indian Tribe History
Native American Nations: Osage
Historic Dates for The United States Postal Service
History of The U.S. Postal Service
another history page of the postal service
Spotlight: U.S. Postal Service interesting facts, there are other links as well here
Start working on memory work for this book, Psalm 8
Simple Machines for Kids
A to Z Home's Cool Simple Machines Pages
KidsConnect: Simple machines
The Topic: Simple Machines lots of links here!