L. Frank Baum 
Dorothy and the Wizard in Oz (Illustrated) [EPUB ebook] 

On her way back from Australia, Dorothy visits her cousin, Zeb, in California. They are soon swallowed up by an earthquake, along with Zeb’s horse Jim and Dorothy’s cat Eureka. The group soon meets up with the Wizard and all travel underground back to Oz.
A Faithful Record of Their Amazing Adventures
in an Underground World; and How with the
Aid of Their Friends Zeb Hugson, Eureka
the Kitten, and Jim the Cab-Horse,
They Finally Reached the
Wonderful Land
of Oz