L Frank Baum 
Oxford Children’s Classics: The Wonderful Wizard of Oz [PDF ebook] 

This Oxford Children’s Classic features the complete unabridged text, an introduction by Lemn Sissay, and other bonus material including insights for readers, facts, activities, and more . . .When a great tornado carries Dorothy to the land of Oz, she finds herself alone in a strange and enchanted place. If she is ever to see her Kansas home again, she must travel to the Emerald City and ask the Wizard of Oz for help. It’s a daunting journey, but with Dorothy’s new friends at her side-the scarecrow, the tinman, and the cowardly lion-anything is possible.