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Addenda is our online area containing supplementary content for our books. This content has been designed under the guidance and supervision of the books' authors and directors, and its purpose is to enrich understanding of the subject and help in its learning.Addenda provides access, depending upon the book in question, to updates, related documentation, other links of interest, learning exercises and activities, online consultations with teachers to answer questions, etc.

Publications with supplementary content in the Addenda section of our website have a personalised code, which you will find printed on the inside back cover, to provide access to it. In all cases, there is free content, and in some there is also additional paid content.
 
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En Huygens Editorial
C/ Pàdua, 20, bajo 1 - 08023 Barcelona