Learn where our mail goes and how it gets there in this classic nonfiction picture book by Washington Post/Children's Book Guild Award winner Gail Gibbons.

Do you ever mail a letter and wonder what happens to it after you drop it in the box?

Read all about the post office and learn how letters are weighed, sorted, transported, culled, canceled, coded, binned, boxed, and sorted once again.

Find out how people and machines work together to deliver the letters you send.