Each kit includes:
Leveled books in print and digital format - 16 titles, 6 copies of each (96 books total)
Teacher's Guide with activities to develop and assess reading strategies and science content and vocabulary
Digital resources (Interactiv-eBooks, PDF versions of each book, reproducible student activity pages, audio recordings)

Product Name:

Invoice Title: Science Readers: Grade 3 Kit

ISBN-10: 1480746363

ISBN-13: 9781480746367

Each add-on pack includes one copy of each title for that grade. 
(16 books: 16 titles, 1 copy each)

Product Name:

Invoice Title: Science Readers: Grade 3 Add-on Pack

ISBN-10: 1480746746

ISBN-13: 9781480746749