Sincerely, Emerson : a girl, her letter, and the helpers all around us by Weber, Emerson 

BTSB Prebound(Harper, 2020)

BTSB #: 927738 Available

Dewey: 177.7/NAges: 4-8   
AR: 2.9 LG

Genres:

Subjects: Thank-you notes Postal service Gratitude

Summary: A young girl sends a letter to her postman-and an outpouring of love for her follows in this nonfiction picture book that celebrates the essential workers all around us.

U.S. Postal Service : the history of America's mail system [Landmarks of democracy: American institutions]by Uphall, Margaret 

BTSB Prebound(PowerKids, 2018)

BTSB #: 900312 Available

Dewey: 383/NAges: 7-10   
AR: 6.1 MG

Genres:

Subjects: United States Postal Service Postal service

Summary: An introduction to the postal service, the only delivery service that reaches every address in the United States.