| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Idaho Business Directory 1990-91 | 978-1-56105-002-4 (1-56105-002-4) | 1990 |
| Montana Business Directory 1990-1991 | 978-1-56105-003-1 (1-56105-003-2) | 1990 |
| Nevada Business Directory 1990-1991 | 978-1-56105-012-3 (1-56105-012-1) | 1990 |