Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
3.5
Points
0.5
Fiction/Nonfiction
Nonfiction
Word Count
585
Points per Word
0.000855
Page Count
32
Points per Page
0.015625
Description
Readers learn how important information and valuable items are kept safe and how they are stored in underground vaults, including recordings and photos from U.S. history, important documents, and more.