Books for use with state history and science standards are often hard to find. National publishers tend to focus on topics they can market nationally. State Standards Publishing is working to fill that niche in Georgia.
The newest set in the Georgia, My State series is Rocks and Minerals, written by Samantha Sanford. AR levels are pending, but Lexile levels range from 560-600, so they should come in at solid third grade reading levels.
Books are available in library bound and paperback.