Purely Rosie Pearl by Patricia A. Cochrane

I liked this story because it had a different flavor to it than most.  Rosie Pearl is a 12 year old girl who is a migrant worker with her family during the great depression.  Their southern farm was destroyed by dust storms and they moved west to follow the crops.  The description of migrant life is vivid and detailed.  The story chronicles her family's summer, their experiences in California, and Rosie Pearl's relationship with her new "educated" friend Maggie.  Funny and poignant.  Don't let the dated looking cover turn you off.