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Based on HLL German 1, by Lotte Fischer, Gertrud Grote and Illa Hayward, published 1979.
[Bd.1]: Keybook - [Bd.2]: HLL Deutsch - [Bd.3]: Übungsbuch.
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HLL Deutsch. ISBN 0906638062. Published by HLL Ltd. in 1990. Publication and catalogue information, links to buy online and reader comments.