HarperCollins has revealed the cover and title of a posthumously published Shel Silverstein poetry collection: Every Thing On It. The publisher will print one million copies of the September release.

Here’s more about the book: “With more than one hundred and thirty never-before-seen poems and drawings completed by the cherished American artist and selected by his family from his archives, this collection will follow in the tradition and format of his acclaimed poetry classics.”

Silverstein passed away in 1999, but his children’s poetry collections (Where the Sidewalk Ends and A Light in the Attic) have a dedicated audience. The poet, illustrator and songwriter hesitated to enter the children’s market until he met the legendary children’s editor Ursula Nordstrom and she convinced him to try.