Recommended Books for kids on the Black Hills region?

I downloaded this book for my DGD, who is younger but reads above her grade level. It's meant for children between the ages of 9-12 years of age:

http://www.amazon.com/In-Their-Own-Words-Sitting/dp/0439263220

As well there is a series of books published by Blue Earth Books about native American leaders. Both Sitting Bull and Crazy Horse are included. She enjoyed this series a lot and it has great illustrations.

I'd guess that series of books is for 2nd/3rd grade.

I've seen this book online but never viewed it w/ an eye towards purchasing/borrowing it:

http://www.barnesandnoble.com/w/little-miss-history-travels-to-mount-rushmore-barbara-ann-mojica/1113865567?ean=9780988503007

HTH