The easiest way to find e-books by subject is the search with relevant keywords. Additionally, we recommend to search with Dewey Decimal Classification (DDC) numbers (only possible in the German language version of the online catalog). Please click on Thematisch, then choose DDC. To find an outline of DDC numbers please click on Summaries. Starting your research with a specific DDC number you will receive a list of titles in the JFKI Library and other libraries of the campus of Freie Universität.