Sometimes it can be difficult to source enough topical books from the class or school library that match in and explore the theme you are working on. As you are well aware, topical books can form platforms for so much discussion and ideas and they really help inform the childrens learning and play. I like to try and fit in the drop everythng and read (DEAR) day for about ten minutes at least. Obviously it is most productive if the books are on topic and egnite the children's thought and imagination. You also have to have enough books to be shared around all the children.