| title | ISBN-13 | year of publica- tion |
|---|---|---|
| Directory of Manufacturers and Exporters of Germany | 978-0-900850-09-7 | 1969 |
| Directory of Manufacturers and Exporters of Hong Kong | 978-0-900850-06-6 | 1969 |
| Directory of Manufacturers and Exporters of Italy | 978-0-900850-08-0 | 1969 |
| Export-import without Capital | 978-0-900850-05-9 | 1972 |
| Extra Cash from Mail Order | 978-0-900850-18-9 | 1970 |
| Simplified Mail Order Bookkeeping | 978-0-900850-19-6 | 1969 |