The book is 'hers'. [=the book belongs to her; it is her book]
a former professor 'of hers' [=one of her former professors]
That face 'of hers' [=her face] is hard to forget.
(..) as soon as I hit the water. I should have worn a swim cap like Mama said. See, I asked my mama could she make my hair like Coretta Scott King had hers at the Washington March. But she said that was too grown. Oh, I love her hair. I heard she don't even put rollers in it. It's just like that. (..)2014 Selma