H. E. · H.S. · Harold E. · S. E.
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Practical FORTRAN: An applied and simplified, problem-solving approach | 978-0-02-333730-7 (0-02-333730-3) | 1975 |
| Trigonometry: A complete and concrete approach | 978-0-07-019419-9 (0-07-019419-X) | 1981 |