| title | ISBN-13 | year of publication |
|---|---|---|
| Spectrum Math 1 Gold | 978-0-07-572330-1 | 2001 |
| Spectrum Math 2 Brown | 978-0-07-572331-8 | 2001 |
| Spectrum Math 3 Red | 978-0-07-572332-5 | 2001 |
| Spectrum Math 4 Orange | 978-0-07-572333-2 | 2001 |
| Spectrum Math 5 Yellow | 978-0-07-572334-9 | 2001 |
| Spectrum Math 6 Green | 978-0-07-572335-6 | 2002 |
| Spectrum Math 7 Blue | 978-0-07-572336-3 | 2001 |
N Freeman · R. F. · R Freeman · R.N. · Richard F. · Richard Freeman · Richard N.