Johnny leaves the copy of Gone with the Wind to Ponyboy. Why is this significant ? How does it illustrate their friendship?

Gone with the Wind is the book that Ponyboy and Johnny read together while they hide in the old church. Johnny finds the book significant because he remembered Pony "sayin' somethin' about it once." This speaks to the significance of Pony in Johnny's life. A simple reference to a book made Johnny buy it because he could share that experience with his friend. Gone with the Wind has themes of bravery and honour, themes that both boys are contemplating in their own lives.