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Here is a link to some books about pawpaws. Pawpaw Books
This one below seems an especially nice pawpaw book.
This year I planted 3 more pawpaw trees near the native ones I found last fall. Pawpaws need to be cross pollinated so hopefully putting more nearby will help them all.
After planting two pawpaw trees last spring, I ended up finding some in my woods. This is the leaf from one.