This pack includes all 110 decodable books from Sets 6 to 14.
Individual sets can be purchased here:
Nelson Decodable Readers Set 6
Nelson Decodable Readers Set 7
Nelson Decodable Readers Set 8
Nelson Decodable Readers Set 9
Nelson Decodable Readers Set 10
Nelson Decodable Readers Set 11
Nelson Decodable Readers Set 12