<page_title> List of Oz books </page_title> <section_title> Subsequent books by other writers published by Reilly & Lee </section_title> <table> <cell> The Hidden Valley of Oz <col_header> Title </col_header> </cell> <cell> 1951 <col_header> Year </col_header> </cell> </table>
The Hidden Valley of Oz (1951) is one of the series of Oz books.