| title | ISBN-13 | year of publication |
|---|---|---|
| Language/30 Danish: a Conversation Course using a Proven Self-Learning Method; Two Audio Cassettes, and a Phrase Dictionary and Study Guide | 978-0-910542-03-6 | 1975 |
| Latin: Start Speaking Today! | 978-0-910542-89-0 | 1995 |
| Polish: Language 30 | 978-0-910542-83-8 | 1995 |
| Practical English for Arabic Speakers | 978-1-57970-173-4 | 2005 |
| Thai: Start Speaking Today | 978-1-931850-12-4 | 2004 |
| This Is Electronics: Circuits and Applications | 978-0-02-681220-7 | 1970 |
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