Through the hidden door

Two boys stumble upon the remains of an ancient underground civilization.

Dial Books for Young Readers
1987
9780803702769
book
Lexile: 
710

Holdings

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132616400731122692459746917LIVH286T 12413F WEL100015754856551709567815
2912860639046015462459746917NWE351NRE0013300FIC100016377825731637782573
3795492710929323992459746917NWE350NRE0013300FIC100016950443851736800991